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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单项选择题
I'm thirsty. I have to stop ______ a drink.
A． to have
B． having
C． have
单项选择题
He didn't go to school ______ he is ill.
A． when
B． as
C． while
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