单项选择题

All of us are trying to find ______ to the company's economic problem.

A．a solution
B．an answer
C．a reply
D．a reaction
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单项选择题
I paid thirty-five yuan for this book, but I think it is worth ______ it.
A．to buy
B．buying
C．to be bought
D．bought
单项选择题
Only yesterday ______ that his watch was missing.
A．he found out
B．he had found out
C．did he find Out
D．had he found out
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