【单选题】We _____ his luggage; his brother carried it himself.
C.
needed to have carried
【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】Knowing that the slightest mistake meant losing his job, the waiter carried the expensive glasses______ from the kitchen.
【简答题】控制系统PID控制器中引入()作用是为了消除余差,引入()作用是为了克服容量滞后;但积分的引入会使系统产生振荡现象。
【单选题】He carried on( )after his accident.
【单选题】He expected his orders (A) to be carried out (B) on spot (C) .
【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.