单项选择题

The disappearance of her paper has never been ______.

A．counted for
B．looked upon
C．accounted for
D．checked up
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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
单项选择题
How strict tutors are with their pupils ______ a strong impact on the quality of their pupils' academic papers.
A．has
B．have
C．having
D．to have
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