单项选择题

He wrote the book in ______with his wife.

A. proportion
B. installment
C. correspondence
D. collaboration
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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
单项选择题
Some companies have introduced flexible working time with less emphasis on pressure______.
A. than more on efficiency
B. and more on efficiency
C. and more efficiency
D. than efficiency
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