单项选择题

Now I regret ______ worked harder at school.

A. not to have
B. not have
C. not having
D. having not
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单项选择题
The word poem is concrete, ______ poetry is abstract.
A. when
B. as
C. while
D. since
单项选择题
I don't mind ______ the decision as long as it is not too late.
A. you to delay making
B. your delaying making
C. your delaying to make
D. you delay to make
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