The students ____________ a biology class when the visitors came.A.werehaving B.are having C.will have D.had

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The students ____________ a biology class when the visitors came.A.werehaving B.are having C.will have D.had
The students ____________ a biology class when the visitors came.
A.werehaving B.are having C.will have D.had

The students ____________ a biology class when the visitors came.A.werehaving B.are having C.will have D.had
应选A
在选词填空之前,根据中文翻译的意思,句子可能的大意为:参观者进来的时候,学生们正在上生物课,或学生们将上生物课,或学生们已经上了生物课.
由常理可知,这句话是要说明 参观者进来时,学生们正在上生物课.
(经典题型:一个动作发生时,另一个动作正在发生)
并且由后半句时间状语从句的动词得知,参观者进来这个动作是发生在过去,因此同时进行的这个动作也应是过去进行时.

啊过去进行时选a,有when这个时间状语提示。

A were having
The students were having a biology class when the visitors came.
当参观者到来的时候,学生们正在上生物课。是不是有什么公式啊?当某个动作发生的时候,另一个动作正在进行或还在持续过去进行时有公式吗?是什么?就是在过去的某个时间点或当某个动作发生的时候,另一个动作正在进行或还在持续

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A were having
The students were having a biology class when the visitors came.
当参观者到来的时候,学生们正在上生物课。

收起

选A
when后面接短暂性动词 while后面接持续性动词
一般情况下 when后面接非进行时 前面接进行时 while相反

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