单项选择题

He didn't go to school ______ he is ill.

A．when
B．as
C．while
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单项选择题
Lucy and Lily are twins. They ______.
A．look like
B．look the same
C．look after
单项选择题
— Must I go there at nine— No, you
A．must
B．mustn't
C．needn't
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