If the temperature of the reactor______500degrees higher,mel

If the temperature of the reactor______500degrees higher,meltdown would have occured.
A was B had been C was being D had
为什么选B不选C?望指教!
tcdnn10507 1年前 已收到1个回答 举报

z455400 幼苗

共回答了12个问题采纳率:83.3% 举报

虚拟语气固定时态,主句用过去时,从句用现在完成时

1年前

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