单项选择题

21（）

A．down
B．up
C．away
D．off

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单项选择题

It is very （） of you to let us know you were going to be late. Otherwise, we（）on time.

A. considerate...wouldn’t have begun
B. inconsiderate...would have begun
C. considerable...wouldn’t have begun
D. inconsiderable...wouldn’t begin

单项选择题

（）, I should not have wasted my time trying to explain matters to you.

A. I had not realized what you intended
B. Had I not realized what you intended
C. I had realized what you intended
D. Had I realized what you intended