单项选择题

An old friend called on me the day before yesterday.

A. telephoned
B. rang
C. visited
D. saw
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单项选择题
China does a lot of trade with many countries.
A. a great deal of
B. a great many of
C. a large number of
D. a great level of
单项选择题
And the cars are tested for defects before leaving the factory.
A. functions
B. faults
C. motions
D. parts
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