单项选择题

Mum is getting old, so her memory is not very ______ these days.

A．true
B．forgettable
C．reliable
D．credit
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单项选择题
If ______ to speak, he has no problem expressing himself.
A．asked
B．asking
C．ask
D．to be asked
单项选择题
I’m going to spend the winter vacation in Shanghai, ______ I have relatives.
A．which
B．nevertheless
C．where
D．when
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