单项选择题

There is been competition between the two Motor car firms.()

A. cooperation
B. contest
C. dispute
D. conference

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单项选择题
Tom dropped off in front of fire. ()

A. drop at
B. drop away
C. doze off
D. take off
单项选择题
The Foreign Service is a branch of the Department of State. ()

A. center
B. division
C. root
D. base
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