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 understand ______ preparation that the staff must put in under pressure to meet the deadline.
A．more than the enormous amount of
B．better than most the enormous number of
C．better than most the enormous amount of
D．fewer than the number of
单项选择题
The author was required to submit an ______ of about 200 words together with his research paper.
A．edition
B．editorial
C．article
D．abstract
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