Question

The teacher ________ have thought Johnson was worth it or she wouldn't have wasted time on him, I suppose.

1. A.
   should
2. B.
   can
3. C.
   would
4. D.
   must

Answer 1

D
思路分析：從后面的“or she wouldn't have was ted time on him”可知，前面的分句應(yīng)該表示一種肯定的判斷，故選must。句意是“老師一定是認(rèn)為Johnson值得……”。must have done表示對(duì)發(fā)生于過去的情況的判斷；should應(yīng)該，表示按事理和常規(guī)作判斷；can表示一種可能性；would表過去的意愿或趨勢(shì)。故選D項(xiàng)。
【點(diǎn)評(píng)】該題考查情態(tài)動(dòng)詞的用法，偏難。情態(tài)動(dòng)詞表示一種說話的語氣，考生應(yīng)仔細(xì)品味上下文的語意及句子暗示的語氣作出選擇。