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
Darlington never regretted ______ to attend the party, for she did not like it at all.
A. not being invited
B. being not invited
C. having not been invited
D. not having been invited
单项选择题
It is reported that ______ adopted children want to know who their natural parents are.
A. the most
B. most of
C. most
D. the most of
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