字典翻译 问答 其它 Ifthetemperatureofthereactor______500degreeshigher,meltdownwouldhaveoccured.AwasBhadbeenCwasbeingDhad为什么选B不选C?望指教!
问题标题:
Ifthetemperatureofthereactor______500degreeshigher,meltdownwouldhaveoccured.AwasBhadbeenCwasbeingDhad为什么选B不选C?望指教!
问题描述:

Ifthetemperatureofthereactor______500degreeshigher,meltdownwouldhaveoccured.

AwasBhadbeenCwasbeingDhad

为什么选B不选C?望指教!

高春燕回答:
  虚拟语气固定时态,主句用过去时,从句用现在完成时
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