单项选择题

I regret ______ the work unfinished; I should have planned everything ahead carefully.

A. having been left B. having left
C. to leave
D. to have left

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单项选择题

Paul was very eager to see the star singer, and therefore he arrived at the spot of meeting an hour ______ of schedule.

A. in advance
B. in front
C. ahead
D. in excess

单项选择题

(I recommend) that you all (are) diligent (if) you want to pass (the exam).

A. I recommend
B. are
C. if
D. the exam

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