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单项选择题

21（）

A．became
B．started
C．becomes
D．grow

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单项选择题If we ______ yesterday, we ______ the work.

A．weren't interrupted... would finish
B．didn't interrupt... would have finished
C．hadn't interrupted... had finished
D．hadn't been interrupted... would have finished

单项选择题This is the second letter that he ______ his brother recently.

A．has got to
B．has heard of
C．has received from
D．has heard from