题目内容
20.You either set the alarm clock or ask for a morning call.( )| A. | should | B. | may | C. | ought to | D. | must |
分析 你可以定闹钟或者请求叫醒服务.
解答 答案:B.either…or 或者…或者,should/ought to 应该,must 必须,一定,may 可以,根据句意你可以定闹钟或者请求叫醒服务.两者选其一,故选B.
点评 情态动词(Modal verbs)本身有一定的词义,表示语气的单词.但是不能独立作谓语,只能和动词原形一起构成谓语.情态动词用在行为动词前,表示说话人对这一动作或状态的看法或主观设想. 情态动词虽然数量不多,但用途广泛,主要有下列:can (could),may (might),must,need,ought to,dare (dared),shall (should),will (would) must not.
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