单项选择题

He ______ into the classroom until the bell rang.

A．doesn't come
B．came
C．didn't come
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单项选择题
His grandmother ______ for two years.
A．died
B．has died
C．has been dead
单项选择题
It is ______important work, we must finish it in time.
A．such
B．such an
C．so
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