791.One of the few thigns you ____ say about English people with certainty is that they talk a lot about the weather.
A.need
B.must
C.should
D.can
792.It ________ have been Tom that parked the car here,as he is the only one with a car.
A.may
B.can
C.must
D.should
791.答案是D;此处表示客观可能性。
792.答案是C;根据句意，此处must表示有推测，也许。
