单项选择题

() more time, the scientists will be able to work out a good solution to the problem.

A. Given    
B. Giving      
C. To give     
D. Be given

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单项选择题
Only when we came back home,()that my watch was missing.

A. did I find             
B. I found
C. I had found             
D. Had I found
单项选择题
The departure time of the plane has been postponed, so we have nothing to do now but ______.
A．wait
B．to be waiting
C．to wait
D．waiting
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