单项选择题

You should know better than______your little sister at home by herself.

A. to leave
B. leaving

C. to have left
D. left
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单项选择题
—I'm going to study engineering in Tsinghua University tomorrow. —______.
A．All the best in your study
B．All the best with your study
C．All the best in your business
D．All the best in your new job
单项选择题
Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having
B. had

C. have
D. to have
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