单项选择题

______ he comes, we won't be able to go.

A．Without
B．Unless
C．That
D．Because
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单项选择题
It is necessary that a student ______ his lesson before coming to class.
A．will prepare
B．prepares
C．must prepare
D．prepare
单项选择题
He's unlucky, and he's always suffering ______ luck one after another.
A．a sick
B．sick
C．an ill
D．ill
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