单项选择题

The rest of his life is ______ to the cause of international exchange of visiting scholars.

A．added
B．put
C．saved
D．committed
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单项选择题
You won't know if it fits you until you ______ it on.
A．will try
B．are trying
C．are to try
D．have tried
单项选择题
Dress warmly, ______ you'll catch cold.
A．on the contrary
B．or else
C．or rather
D．in no way
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