单项选择题

The article suggests that when a person______ under unusual stress he should be especially careful to have a well-balanced diet.

A．is
B．were
C．be
D．was
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单项选择题
These are signs ______ restaurants are becoming more popular with families.
A．that
B．which
C．in which
D．whose
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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