单项选择题

Anyone who has a sore throat should ______ from alcohol.

A．abstain
B．retain
C．detain
D．attain
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单项选择题
______ he did well at chess, he was rather weak in maths.
A．As
B．When
C．While
D．Even if
单项选择题
It ______ the eldest son to make provision for his aged father.
A．lies in
B．lies off
C．lies to
D．lies on
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