单项选择题

The government had to ______ all his appointments for the day and rushed to the train accident.

A．set off
B．see off
C．call off
D．pay off
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单项选择题
Mr. Smith's condition looks serious and it is doubtful if he will ______.
A．pull through
B．pull up
C．pull back
D．pull out
单项选择题
Not having a good command of English can be a serious ______ preventing you from achieving your goals.
A．obstacle
B．fault
C．offense
D．distress
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