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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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
单项选择题
A small percentage of the grain ______ ruined by the prolonged rain.
A．was
B．were
C．is
D．are
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