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
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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
单项选择题
It is important to provide an environment ______ people are encouraged to make suggestions at all levels of the company.
A) from which
B) on which
C) in which
D) for which
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