He _______here since breakfast.A.must come B.must been here

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He _______here since breakfast.A.must come B.must been here C.must come here D.come here
选择正确答案

B
再问： I think so too.but why is that ?
再答： must have done 他一定是从早餐后就呆在这儿了。表假设。
再问： must 应该是表示推测吗？
再答：是。表示有很大的可能性。如果可能性不高，会用may have done

He _______here since breakfast.A.must come B.must been here It is a long time since he moved here ,he must have___here.A He must have been there yesterday,___he?A.must B.mustn't C.w he must ( )here.《be》 He must have been here yesterday,( 改为反义疑问句 Jim ____ here since he came here.A.has been working B.works He must be ill,｛｝he looks so pale.A.since B.because C.as D.f ( ) 6.--- Must he come here tomorrow?--- No,_____. You must come here if you have _____ time.A.some B.any C.not He must be ill,____________he looks so pale.A.since B.becaus He ____ this school since September.A.has come to B.has been i think he must have been a mechanic,中的must和have been是什么词啊?