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
Betty advised me to label our luggage carefully in case it gets () in transit.

A. misused
B. mishandled
C. mistaken
D. mislaid
单项选择题
The boy has admitted to () the window while playing football yesterday.

A. breaking
B. having been broken
C. break
D. be breaking
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