单项选择题

I only called the police when I ______ everything else.

A. tried
B. was trying
C. had tried
D. had been trying
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单项选择题
Will you please lend me the novel when you ______ it
A. will finish
B. have finished
C. will have finished
D. finishing
单项选择题
I ______ them in the past few years.

A. has met
B. met
C. haven’t met
D. haven’t been met
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