1visitors are not permitted __the park after dark because of the lack of lighting A to enter B entering C to enter in D entering in

1visitors are not permitted __the park after dark because of the lack of lighting A to enter B entering C to enter in D entering in
1visitors are not permitted __the park after dark because of the lack of lighting
A to enter B entering C to enter in D entering in

1visitors are not permitted __the park after dark because of the lack of lighting A to enter B entering C to enter in D entering in
选A.首先,permit sb to do sth允许某人做某事 .其次,enter是及物动词.enter + 地点即表示进入…完全没必要加介词in.
另附：permit
1.名词 [c] (authorization) 许可证
2.及物动词 [frm] (allow) 允许
3.及物动词 (make possible) 容许
fishing permit
捕鱼许可证
to permit sb to do sth
允许某人做某事
4.及物动词 (make possible) 使某人可能做某事
weather permitting
天气许可的话
enter
1.及物动词 [+room] [ building] 进入
2.及物动词 [+army] [ profession] [ Parliament] 入
3.及物动词 [+race] [ competition] 参加
4.及物动词 [+new phase] [ period] 开始进入
5.及物动词 (write down) (in book) 登录
6.及物动词 [计算机科学] [+data] 输入
7.不及物动词 [frm] (come or go in) 进来
to enter sb for sth
给某人报名参加某事
as the war enters its second month
当战争进入第2个月时

答案：C。
A与B（即是该用不定式，还是现在分词形式）的解析：allow与permit的用法区别的用法区别
1. 两者均可表示“允许”，其区别是permit 通常指上级、规则或法令等表示的准许，其语气较重；而 allow 通常指消极地不加反对，有时含有听任或默许之意，语气较轻。如：Nothing is permitted; everything is allowed. 一切都没明...

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答案：C。
A与B（即是该用不定式，还是现在分词形式）的解析：allow与permit的用法区别的用法区别
1. 两者均可表示“允许”，其区别是permit 通常指上级、规则或法令等表示的准许，其语气较重；而 allow 通常指消极地不加反对，有时含有听任或默许之意，语气较轻。如：Nothing is permitted; everything is allowed. 一切都没明文规定可以做，但一切做了也无妨。The nurse allowed him to remain there，though it was not permitted. 护士让他留在那儿，而按规定那是不许可的。
2. 从用法上看. 两者后接动词作宾语时，均要用动名词形式，而不能用不定式。如：We don’t allow [permit] swimming in the pool. 我们不许在池子里游泳。但是若其后接有名词或代词，那么其后须接不定式。如：We don’t allow [permit] children to swim in the pool. 我们不许孩子们在池子里游泳。注意这类结构的被动式之后可用不定式(此时的不定式不是宾语，而是主语补语)。如：正：We do not allow [permit] people to smoke here.正：People are not allowed [permitted] to smoke here.误：People are not allowed [permitted] smoking here.

对enter的解析：enter本身的意思是：
及物动词 vt.
1.进入
He entered the classroom.
他进了教室。
2.参加;加入
The United States did not enter the war until April 19, 1917.
美国直到一九一七年四月十九日才参战。
3.使参加;使进入
They entered their child at a private school.
他们让他们的孩子在一所私立学校就读。
4.开始从事;开始进入
He entered politics at the age of 30.
他三十岁开始从政。
5.登录;将...输入
He showed me how to enter data into the computer.
他告诉我如何将数据输入计算机。
不及物动词 vi.
1.进入
He rose as she entered.
他在她进来时站起身来。
2.参加,加入[(+for)]
He decided not to enter for the race.
他决定不报名参加比赛。
也就是说它本来就用进入的意思了，不需要再加介词in。

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选C项，permit后面跟的是动名词，D项中的意思重复。permit 通常指上级、规则或法令等表示的准许，两者后接动词作宾语时，均要用动名词形式，而不能用不定式。