单项选择题

I was really shocked that they ______ have behaved so rudely to an old man like him.

A. should
B. would
C. might
D. could
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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
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
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