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
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单项选择题
A．mightB．shouldC．wouldD．could
A．might
B．should
C．would
D．could
单项选择题
A．itB．televisionC．the designD．the machine
A．it
B．television
C．the design
D．the machine
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