单项选择题

The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.

A．automatically
B．artificially
C．superficially
D．manually
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How strict tutors are with their pupils ______ a strong impact on the quality of their pupils' academic papers.
A．has
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To be honest, I'd rather you ______ anything about it for the time being.
A．have done
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