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The issue is how to（）of radioactive waste.

A. deal
B. dispose
C. disposal
D. do

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单项选择题

I'm tired out. I（）all afternoon and I don't seem to have finished anything.

A. shopped
B. have shopped
C. had shopped
D. have been shopping

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Let's learn to use the problem we are facing（）a stepping-stone to future success.

A. to
B. for
C. as
D. by

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