单项选择题

I regret ______ so much time and money on stamps.

A．to waste
B．for wasting
C．having wasted
D．at wasting
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单项选择题
All their attempts to ______ the child from the burning building were in vain.
A．regain
B．recover
C．rescue
D．reserve
单项选择题
The ______ goal of the book is to help bridge the gap between research and teaching, particularly the gap between researchers and teachers.
A．joint
B．intensive
C．overall
D．decisive
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