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
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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
单项选择题
______, we can do nothing.
A．Such is the case
B．Such the case being
C．Such the case is
D．Such being the case
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