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
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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
单项选择题
The rapid development of communications technology is transforming the ______ in which people communicate across time and space.
A．route
B．transmission
C．vision
D．manner
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