单项选择题

In order to make myself ~ in English, I am studying hard.

A. understand
B. understanding
C. to understand
D. understood
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单项选择题
He wrote the book in ______with his wife.
A. proportion
B. installment
C. correspondence
D. collaboration
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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