what I can do ____study hard.中间填什么1 are to 2 is to 3 have to 4 has to 谁能帮我分析下.

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whatIcando____studyhard.中间填什么1areto2isto3haveto4hasto谁能帮我分析下.whatIcando____studyhard.中间填什么1areto2ist

what I can do ____study hard.中间填什么1 are to 2 is to 3 have to 4 has to 谁能帮我分析下.
what I can do ____study hard.
中间填什么1 are to 2 is to 3 have to 4 has to 谁能帮我分析下.

what I can do ____study hard.中间填什么1 are to 2 is to 3 have to 4 has to 谁能帮我分析下.
选2
分析：what i can do是what引导的名词短语,是单数形式,所以排除1和3；一般have/has to前面的主语一般是人,而在这里显然不搭配;所以选择2.
PS：如有is选项的话也不可以选,因为如果是is的话,后面要接名词,如是动词的话,要接它的动名词形式(-ing),在本题中就该是studying hard.

2 is to
what i can do 是一个从句做主语，也就是主语从句。后面的is 是联系动词，to study hard 是一个不定式短语作表语。

2
what I can do是主语，我能做的
is是谓语
what I can do is to study hard.
我能做的就是努力学习。

第二个

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