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15.________ I have a quick word with you?Something important has happened.(  )
A.MustB.CouldC.WouldD.Should

分析 我可以抓紧时间和你说句话吗?发生了重要的事情.

解答 答案:选B 
must"必须"用在此处显然不合适,would"愿意",在一般疑问句中,主要用于第二人称;should"应该".
could 是can的一般过去时,表示语气比较委婉,Could I do sth.表示请求,许可;故选B.

点评 需要记住could的用法:一、could是can的过去式,用来表示过去的能力、可能性或允许.二、表示推测,常用于虚拟语气中.三、用于表示试探性或礼貌.用于第一人称,表示"请求、许可".该题考察的是could的第三种用法.

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