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询问一下这些选择题的答案和解答的原因,谢谢!

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询问一下这些选择题的答案和解答的原因,谢谢!
1.The girl sitting next to me on the plane was very nervous,for she____before.
A.did not fly B.has not flown C.had not flown D.was not flying
2.I_____my clothes,and the phone rang.
A.wash B.washed C.am washing D.was washing
3.Angel is "keen on" all kinds of pop music.The "keen on" means "_____".
A.is surprised at B.is famous for C.is fond of D.is worried about
询问一下这些选择题的答案和解答的原因,谢谢!
B 这是因为现在完成时表过去发生的事对现在造成的结果.
D 背景是电话铃响了,而且是过去时.过程用进行时.
C 喜欢做某事