单项选择题

The fire was finally brought under control, but not ______ extensive damage had been caused.

A. after
B. before
C. since

D. as

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单项选择题

You should have put the milk in the icebox; I expect it ______ undrinkable by now.

A. became

B. had become
C. becomes

D. has become

单项选择题

Mr. Johnson prefers that ______ with him personally.

A. she speaks

B. she will speak
C. she speak

D. she would speak

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