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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单项选择题
John doesn t believe in ______ medicine; he has some remedies of his own.
A．standard
B．regular
C．routine
D．conventional
单项选择题
All their attempts to ______ the child from the burning building were in vain.
A．regain
B．recover
C．rescue
D．reserve
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