单项选择题

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

A．manually
B．artificially
C．automatically
D．synthetically
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单项选择题
The explorer lost his way so he climbed to the top of the hill to ______ himself.
A．spot
B．locate
C．place
D．situate
单项选择题
you should not think that experts are ______ right.
A．steadily
B．invariably
C．continuously
D．constantly
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