单项选择题

He had a bad cold. _______ is why he didn’’t come.

A．It
B．This
C．That
D．What
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单项选择题
A．improveB．enhanceC．developD．proceed
A．improve
B．enhance
C．develop
D．proceed
单项选择题
Cut off by the storm, they were forced to______ food for several.
A．go in for
B．go over
C．go without
D．go out
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