单项选择题

It was yesterday ______ an eighteen-year-old soldier saved the girl from the river.

A．when
B．that
C．before
D．while
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单项选择题
If John leaves, we'll be in trouble, ______
A．if he
B．does he
C．won't we
D．don't we
单项选择题
—Who has been planning the dance —Everyone in the class ______.
A．is
B．has
C．have
D．are
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