The staff chatting cheerfully during the coffee break when the boss came in．A.wa
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The staff ________ chatting cheerfully during the coffee break when the boss came in．
A.was
B.were
C.have been
D.has been
试题答案
B
这句句子的意思是“当老板走进来时，员工们正热烈地讨论着。”从时态上来看，前半句应用过去进行时，而不是现在完成时，所以选项C和D均不对。而staff是集体名词，谓语动词用复数。