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单项选择题

A. give upB. put upC. hang upD. ring upI had to （）becau……

I had to （）because someone else wanted to use the phone.

A. give up
B. put up
C. hang up
D. ring up

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单项选择题—When can we discuss the problem —（）when we can, we must prepare for it right now.

A. No matter
B. Even though
C. As soon as
D. So that