The number of the workers in this factory ______ this year.
A.are increased
B.have been increased
C.has been increased
D.is increased

A.A.are
B.have
C.has
D.is

【参考答案】

C
解析：该句的真正主语是number，为单数名词，句中的时间状语this year提示谓语动词应用完成时态。注......

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