单项选择题

He ______ to work yesterday because he was ill.

A．didn't come
B．haven't come
C．hadn't come
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单项选择题
Computer is ______ invention.
A．so an important
B．such an important
C．such important
单项选择题
You haven't heard from John for a long time, ______ you
A．are
B．do
C．have
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