单项选择题

A doctor's obligation when he can no longer______ the approach of death is to make the patient comfortable, including easing his pain.

A．hang around
B．hang on
C．hold back
D．hold on
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单项选择题
He______ a well meant but unsuccessful campaign to ease East West tensions calling for arms reduction and a summit of the nuclear powers.
A．embarked on
B．reckoned on
C．caught on
D．dwelt on
单项选择题
Had he worked harder, he______ the exam.
A．must have got through
B．would get through
C．could get through
D．would have got through
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