单项选择题

The market economy is quickly changing people's idea on ______ is accepted.

A) that
B) which
C) what
D) how
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单项选择题
______ in this company for many years, John has become experienced in business negotiations.
A) Having worked
B) Have been working
C) Have worked
D) Worked
单项选择题
Not until he arrived at the office ______ he had forgotten to bring the document.
A) he realized
B) did he realize
C) he did realize
D) does he realize
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