单项选择题

I have been for years troubling the pages of historians, to find out what our fathers have done to the native Americans, but I must say, that my researches have ______ been to no effect.

A．therefore
B．hitherto
C．however
D．nevertheless
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单项选择题
A Boeing 747 crashed into a hillside while attempting to land during a nighttime storm; 228 of the 254 people who were on board the plane ______.
A．patrolled
B．perceived
C．perished
D．plunged
单项选择题
Meg did not say this ______, and when she had finished, she turned to Ethel with a smile.
A．rudely
B．toughly
C．routinely
D．kindly
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