Question

—Whose pencil box is this?—It _____ be Tom’s. It has his name on it. A．must B．may C．m

—Whose pencil box is this?—It _____ be Tom’s. It has his name on it. A．must B．may C．might D．can’t

Answer 1

A

试题分析：句意：这是谁的铅笔盒？它一定是汤姆的，上面有他的名字。A. must必须，一定是；                                                             B. may可能；   C. might可能；          D. can’t不能，一定不是，根据提示“一定是”此处表肯定的推测，所以用must，故选A。