Class Two___taking their lessons when there was a knock at the door.A.is B.are C.was D.were 答案是D可是这里不是应该把class two当成一个整体吗

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Class Two___taking their lessons when there was a knock at the door.A.is B.are C.was D.were 答案是D可是这里不是应该把class two当成一个整体吗
Class Two___taking their lessons when there was a knock at the door.A.is B.are C.was D.were 答案是D可是这里不是应该把class two当成一个整体吗

Class Two___taking their lessons when there was a knock at the door.A.is B.are C.was D.were 答案是D可是这里不是应该把class two当成一个整体吗
从their lessons 尤其是their 来看,应该是强调个体,所以谓语用复数were而不是was