单项选择题

Nobody noticed the thief slip into the house because the lights happened to ().

A. be put up
B. give in
C. be turned on
D. go out

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单项选择题
Shirley () a book about China last year but I don't know whether she has finished it.

A. has written
B. wrote
C. had written
D. was writing
单项选择题
It isn't quite () whether she will take the advice.

A. sure
B. right
C. certain
D. exact
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