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英语过去进行时They all looked at the man surprisedly.No one knew wh

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英语过去进行时
They all looked at the man surprisedly.No one knew what ______.A.is happening B.has happened C.was happening D.have happened答案是C如何理解
英语过去进行时They all looked at the man surprisedly.No one knew wh
They all looked at the man surprisedly.No one knew what ______.
A.is happening B.has happened
C.was happening D.have happened
【答案】C
【解析】通过前句的 looked 和 knew 可以判断出是过去时态,根据时态一致的原则,也要选个过去时态,而 is,has,have 都是现在时,所以排除.