单项选择题

I was really shocked that they _________ have behaved so rudely to an old man like him.

A．should
B．would
C．might
D．could
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单项选择题
Trade dispute is one of the major issues that ___________ Sino-US relations.
A．bothers
B．bother
C．is bothering
D．has bothered
单项选择题
Sooner or later, you will have to __________ what you did to her the day before yesterday.
A．pay for
B．pay up
C．pay out
D．pay back
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