单项选择题

You don't need to carry large amounts of cash; actually all financial businesses will be conducted by computers.()

A. transmissions
B. transitions
C. transactions
D. transportation

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单项选择题

I have been trying to give up smoking().

A. give off
B. put up
C. quit
D. accept

单项选择题

John is collaborating with Mary in writing an article()

A. cooperating
B. competing
C. combining
D. arguing

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