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
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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
单项选择题
______ you've tried it, you can't imagine how pleasant it is.
A．Unless
B．Because
C．Although
D．When
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