单项选择题

Force is measured in pound ______it is produced.

A．whenever
B．how
C．no matter how
D．although
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单项选择题
The men on board the ship pulled in the driver ______they feared was seriously injured.
A．whom
B．for whom
C．to whom
D．who
单项选择题
The meeting was so prolonged and exhausting that______ the speakers stopped for refreshments.
A．at ease
B．at random
C．at intervals
D．at large
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