20．-Tom graduated from college at a very young age．
-Oh，he ________ have been a very smart boy then．（　�。�
A．couldB．shouldC．mightD．must

分析 ---湯姆很年輕時(shí)就大學(xué)畢業(yè)了．
---哦，那他那時(shí)一定是個(gè)非常聰明的男孩．

解答 答案是D．考查情態(tài)動(dòng)詞的辨析．could 能，會(huì)；should 應(yīng)該；might 也許；must 一定，表示有依據(jù)的推測(cè)．句意是：---湯姆很年輕時(shí)就大學(xué)畢業(yè)了．---哦，那他那時(shí)一定是個(gè)非常聰明的男孩．故選D．

點(diǎn)評(píng) 解答此類題目，首先要掌握每個(gè)情態(tài)動(dòng)詞的用法及區(qū)別，然后根據(jù)句意選擇正確的答案．

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