单选题
17.
The number of employees at the factory ______ to a minimum so as to lower production costs.
A、
is cutting
B、
are cutting
C、
has been cut
D、
have been cut
【正确答案】
C
【答案解析】
the number of...表示…的数量，谓语单数，排除B、D项，由于数量是被减少，应该用相应的被动态。
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