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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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
单项选择题
Students are expected to pay the loan back ______ they are earning enough.
A) so far as
B) now that
C) even if
D) as soon as
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