单项选择题

Smoking is a very bad habit, which many people find difficult to().

A. break
B. beat
C. breathe
D. cough

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单项选择题
As there was a power cut in the hospital, the surgeon had to () the operation.

A. call for
B. call on
C. call off
D. call up
单项选择题
When the manager went to Canada on business, his () took over all his duties.

A. caretaker
B. officer
C. deputy
D. commander
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