【单选题】The students were ______ by his humorous words.
【单选题】We _____ his luggage; his brother carried it himself.
C.
needed to have carried
【单选题】控制系统引入积分作用是为了消除余差,但积分的引入会使系统产生振荡现象。而引入微分作用是为了克服( )对系统的影响。
【简答题】We ______ his luggage; his brother carded it himself. A.needn't have carried B.didn't need carrying C.needed to have carried D.didn't need to CalTy
【单选题】He carried on( )after his accident.
【单选题】We his luggage; his brother carried it himself.
C.
needed to have carried
【单选题】Doubting that the traveler carried drugs, the Customs officer stopped him and _______ his suitcase, but found nothing at all.
【单选题】It is desired that his order______ as soon as possible.