[单选题]The employees ( )more enthusiastic about their work since their pay rose. 

A

are

B

have been

C

were

D

will be

正确答案:B
题目解析

本题考查现在完成时的判断与使用。

since意为“自...以来”,一般跟完成时态连用,故B选项符合题意。

句意:自从工资上涨以来,员工们对工作更加热情了。

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