1.-Who is the girl standing over there? -Well,if you_____know,her name is Mary. A.may B.can C.must D.shall他答案给的是c可是我不知道A为什么不行，不一定是完全肯定的推测啊2.I wasn't sure whether I____offer to help or not.(A) A.should B.might C.would D.can 答案B 为什么不可以？3."What has happened to Tom ?"(D) "I don't know.He____lost ." A.could get B.might get C.can have got D.may have got 我选的D为什么不对？？谢谢老大了，好久没发作文上来了，累死我了快

错了错了第三题我选的B

1.-Who is the girl standing over there? -Well,if you_____know,her name is Mary. A.may B.can C.must D.shall must be 才表推测，这里是坚持的意思，”如果你非要知道” 2.I wasn't sure whether I____offer to help or not.(A) A.should B.might C.would D.can should 表责任，might表要求，你看哪个更好？ 3."What has happened to Tom ?"(D) "I don't know.He____lost ." A.could get B.might get C.can have got D.may have got 对什么时间的推测？对过去加have　done