单项选择题

It was essential that a meeting ______ this week.

A. must be convened

B. would be convened
C. be convened

D. was convened
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单项选择题
Acute hearing helps most animals sense the approach of thunderstorms long before people __________.

A. do
B. hear
C. do them
D. hearing it
单项选择题
The reporters exposed the corruption of several senior officers in the government; consequently, these officers _________ to resign from office.
A. have asked
B. were asked
C. had asked
D. had been asked
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