21、He could have helped us, but he ___ from coming in time by a traffic jam.
A．has been prevented B．had been prevented
C．is prevented D．was prevented
21、D
科目：高中英語 來源： 題型：
He could have helped us, but he ___ from coming in time by a traffic jam.
A．has been prevented B．had been prevented
C．is prevented D．was prevented
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