题目内容
I don't know whether you happen ________ , but I'm going to study in the USA this September.
[ ]
A.to be heard
B.to be hearing
C.to hear
D.to have heard
答案:D
解析:
解析:
|
我不知道你是否听到了…… happen to do,固定结构,听说过,发生在过去,用完成时。 |
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