be operating on用法 讲一讲operate的搭配

be operating on用法 讲一讲operate的搭配 be on用法 英语翻译Material or equipment offered to meet the requirements of this specification must be pre-qualified based on a demonstrable operating experience.To qualify,the following criteria must be satisfied:回答的都很好，可是分只能给一 be on holiday 的on怎么讲 Unfortunately, the expert from Australia refused to __.A operating B operate C operate on D be operate on be addicted to operating computers 意思?operating “操作”? operating the man over there was injured in a car accident yesterdayA．operate on B．operating on C．being operated on D．to be operate be seated on是什么用法 还有be dressed in on business怎么讲?有什么特殊用法么？ be busy的用法 能举个例子给讲一下吗? 讲一下be about to 的用法,最后有例句. The patients needed _________ at that time.A．operations B．operating C．to be operated D．to operate on must be 是一定式?用法呢 [D3] Mr.Smith urged the boy _____ _____ at once.A.referred to ; operated on B.referred to ; be operated on C.referring to ; operated on D.refer to ; operating on 请翻译包括选项,并分析. be on的用法具体一点,举例说明,要常用的. to be on time的意思及用法? wear,dress,put on,be in的用法