单项选择题

______ is often the case with children, Tom was completely better by the time the doctor arrived.

A．It
B．As
C．What
D．which
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单项选择题
She thought I was talking about her son______ actually, I was talking about my son.
A．whom
B．where
C．which
D．while
单项选择题
His sister always spends so much______ clothes that she can' t manage to live within her income.
A．for
B．in
C．at
D．on
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