单项选择题

As time went on, the theory she had stuck () correct.

A. proved
B. to proving
C. to proved
D. to prove

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单项选择题
I don't think he could have done such a stupid thing last night,().

A. do I
B. could be
C. has he
D. did he
单项选择题
The old lady has never () the house since she moved in.

A. been away
B. left
C. lived
D. stayed at
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