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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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
单项选择题
We often provide our children with toys, footballs or basketballs, ______ that all children like these things.
A．thinking
B．think
C．to think
D．thought
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