单项选择题

In international trade, the U.S. met with serious setbacks because of ___________ .

A．serious competition for markets
B．lowered tariff
C．large deficit
D．a strong American dollar
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单项选择题
Considering his lack of experience, his plan isn't likely to come ___________ .
A．off
B．out
C．round
D．over
单项选择题
He _______ himself with a false beard and a pair of sunglasses.
A．hid
B．covered
C．concealed
D．disguised
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