英语语法知识求助：句子是i sent invitations to 80 people,__have replied.句子是i sent invitations to 80 people,__have replied.A of whom only 20 of themB only 20 of them whoC of whom only 20 D only 20 who改选哪个呢?这是什么语法

英语语法知识求助：句子是i sent invitations to 80 people,__have replied.句子是i sent invitations to 80 people,__have replied.A of whom only 20 of themB only 20 of them whoC of whom only 20 D only 20 who改选哪个呢?这是什么语法 I sent you a Maths And I sent you English 纠正下英语语法或者优化句子John sent an e-mail to Tom for asking the status of the issuing of ITB for team-A,C,D.For team-C,I have contacted with the bidders’ principals yesterday and sent the CDs to them (except CNI23 and BAOYE by face 英语语法：现在完成时中,never用于否定句是怎么用?下面这个句子对么?I haven't never seen him 英语语法有双重否定等于肯定这一说吗? ln(i) = ? 其中i是复数 求助! send 和 send to 的区别下面两个句子哪个正确?I have received the letter you sent me.I have received the letter you sent to me. 英语语法!求助! I have sent 和I have send 哪个结构是对的?如题 You sent me a postcard,in return,I sent you a postcard ,too.这句话是一般过去时还是现在完成时?You sent me a postcard,in return,I sent you a postcard ,too.这句话是一般过去时还是现在完成时,为什么? 高中英语语法 写理由1.I insisted that a doctor ____ immediatelyA.has been sent for B.sent for C.will be sent for D.be sent for2.was it ____ that I saw last night at the concertA.you B.not you 3道英语语法Who do you suggest be sent to work there?请问为什么不是Who do you suggest that should be sent to work there?I hope the reform being carried out in our country ar present will bring about the desired results.请问这里是resul 英语语法知识是怎样的?I can not swim across the river without a piece of wood.为什么用across而不用through? 英语语法 是who I wanna be 还是whom I,sent,you,have,E-mail,an 已经寄出是不是I have sent sth. 英语语法问题求高人解答!I'm the person who reads hundreds of CVs we get sent each year.这句话中sent做什么成分?为什么会用在get后面?这句话该怎么翻译? I wish to be sent to work in the country.（不定式作宾语）,那个是宾语?分析句子结构,I wish to be sent to work in the country.不定式作宾语怎么看出来的?那个是宾语分析句子结构,