单项选择题

Be careful ______ your health.

A． except
B． of
C． to

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单项选择题

--Does Betty write as ______ as Mary --No. Mary writes ______ than Betty. Mary writes ______ in our class.

A. careful, more careful, the most careful
B. carefully, more carefully, most carefully
C. more carefully, carefully, most carefully

单项选择题

I've looked for my pen everywhere, but I ______ find it.

A． couldn't
B． can't
C． mustn't

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