The entire morale among the employees in Factory B _______ until now ever since the introduction of our new flexible working hou

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问题 The entire morale among the employees in Factory B _______ until now ever since the introduction of our new flexible working hour system.

选项 A、were boosted
B、had been boosted
C、boosting
D、has been boosted

答案D

解析空格内应填入谓语动词(这里需要单数形式的动词)。因为后面没有宾语，所以要考虑被动语态。最后，注意到和ever since的搭配，应选择现在完成时。另外，until now(直到现在)也是使用现在完成时的根据。

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