单项选择题

The whole program is well designed, but some details need further ______ by some experts.

A．
A. proofing

B．
B. modifying

C．
C. demonstrating D, polishing

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The earthquake happened in south Xinjiang on Feb. 24. This ______ killed 266 people.
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C．calamity
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Smith failed to ______ for the deficit in the company's bank balance.
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