单项选择题

Although some bus drivers have signed the collective pay agreement, there are many ______ are refusing to do so.

(A) what
(B) which
(C) who
(D) when
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The company keeps ______ on all business deals, accounting processes, and employment matters.
(A) documentation
(B) encouragement
(C) dependence
(D) institution
单项选择题
It remains to be seen ______ Virotech's decision to acquire BHI Industries will result in increased profits.
(A) whether
(B) in order that
(C) whereas
(D) that
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