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
He _______ himself with a false beard and a pair of sunglasses.
A．hid
B．covered
C．concealed
D．disguised
单项选择题
The best title for this passage might be _________.
A．The Difficulties of Alexandrian Writers
B．The Advantages of Present Day (1925s) Writers
C．The Advance of Writing and Publishing Since Alexandrian Times
D．The Inadequacies of Ancient and Modern Times
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