【简答题】—There is a lot of smoke coming out of the teaching-building there. —Really?It _________ be a fire,most probably. A.can B.ought to C.have to D.must
【简答题】To get a chocolate out of a box requires a lot of unpacking: the box has to be taken out of the paper bag in which it arrived, the cellophane (玻璃纸) wrapper has to be torn off, the lid opened and the p...