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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
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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 what ______.A．is happening B．has happened C．was happening D．have happened答案是C如何理解
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
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