单选题：________ I have a word with you? It won’t take long. A．Ca..

—Is Nick coming by train?—He should, but he ________ not. He likes driving his car.A．must B．mayC．can D．need

Jack wasn't saying anything, but the teacher smiled at him _____ he had done something very clever.A. as if B. in caseC. while D. though

—Look，I’ve bought some bread，including your favorite flavor.—You ________ any because we still have plenty at home.A．should have boughtB．could have boughtC．needn’t have boughtD．mustn’t have bought

一 Shall we attend the concert this evening? 一 Great idea, _____ we can do some shopping first.A. when B. whereC. since D. if

A problem suddenly came to my mind _____ we could find a good way of saving the old man _____ we would not hurt him.A. where; whoB. whether; that C. that; thatD. when; how