单项选择题

I'm very grateful for your help and hope that someday I may be able to do some thing for you ______.

A．in exchange
B．instead
C．in return
D．in particular
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单项选择题
The road sign is easy to read; the words ______ well.
A．make out
B．stand out
C．work out
D．turn out
单项选择题
______ catching the fever himself the man kindly carried the sick child home.
A．A head of
B．At the sight
C．At the risk of
D．By way of
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