单项选择题

______ they will produce cars next years or not hasn't been made clear.

A．Whether
B．That
C．If
D．What
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单项选择题
It was two years ago ______ she went to teach in the mountains, and we have never seen her since then.
A．when
B．before
C．that
D．after
单项选择题
The more you give, ______ you obtain.
A．the more
B．the most
C．the less
D．the least
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