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

分析 我可以抓緊時間和你說句話嗎？發(fā)生了重要的事情．

解答 答案：選B 
must"必須"用在此處顯然不合適，would"愿意"，在一般疑問句中，主要用于第二人稱；should"應(yīng)該"．
could 是can的一般過去時，表示語氣比較委婉，Could I do sth．表示請求，許可；故選B．

點(diǎn)評 需要記住could的用法：一、could是can的過去式，用來表示過去的能力、可能性或允許．二、表示推測，常用于虛擬語氣中．三、用于表示試探性或禮貌．用于第一人稱，表示"請求、許可"．該題考察的是could的第三種用法．

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