5．Tom hasn't come to work since last Friday.________ he have had an accident？A．Must

　　B．Should

　　C．May

　　D．Can

　　答案　D　[疑问句的推测常可用can，一般不用must / may。]

　　6．I'll certainly be surprised if he ________ to tell them what he knows.

　　A．dare

　　B．will dare

　　C．dared

　　D．dares

　　答案　D　[该句中的dare作实义动词而非情态动词，因此有人称和数的变化。]

　　7．—Tom came to work last Friday, but no one has seen him since.

　　—________ he have had an accident?

　　A．Should

　　B．Must

　　C．Might

　　D．Could

　　答案　D　[疑问句的推测常可用could，一般不用must / might。]

　　8．It was really very dangerous；you ________ him seriously.

　　A．might have injured

　　B．might injure

　　C．must injure

　　D．need have injured

　　答案　A　[A是虚拟语气，意为：有可能受到严重伤害。]

　　9．—Mom's gift? She ________ have chosen a better one for me.

　　—She ________ be very happy to know it.

　　A．should；must

　　B．might；wouldn't

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