单项选择题

We hope that as many people as possible ______ join us for the picnic tomorrow.

A．need
B．must
C．should
D．can
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单项选择题
Some people in parts of the world are wasting food ______ some others haven't any.
A．since
B．when
C．as
D．while
单项选择题
There's no light on they ______ be at home.
A．can't
B．mustn't
C．needn't
D．shouldn't
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