单项选择题

Nancy was surprised that they have ______ . They seemed to be a happy couple.

A. split up
B. broken down
C. fallen through
D. knocked out
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单项选择题
Just as a force is required to change the speed of an object, ______ a force must act to cause a change in the direction of the motion.
A. as
B. thus
C. so
D. like
单项选择题
His answer was so confused that I could hardly make any ______ of it at all.
A. explanation
B. meaning
C. sense
D. interpretation
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