18．-where is Tom？He is nowhere to be found．
-I'm not sure，but he _____ have gone to meet Lucy，because Lucy called him earlier．（　�。�
A．mustB．shouldC．mightD．can

分析 --Tom在哪？到處都找不到他．
--我不確定，但是他有可能去見(jiàn)Lucy了，因?yàn)長(zhǎng)ucy早些時(shí)候打電話(huà)給他．

解答 答案：C
解析：A：必須；一定；B：應(yīng)該；C：可能；或許；D：可能．根據(jù)前面的"我不確定"可知Tom"可能"去見(jiàn)Lucy了，故本題答案為C選項(xiàng)．注意：can表示推測(cè)時(shí)一般用于否定句和疑問(wèn)句，故本題不能選擇D選項(xiàng)．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞，做此類(lèi)題目時(shí)一定要分析每個(gè)選項(xiàng)中情態(tài)動(dòng)詞的含義及其用法，再結(jié)合原文及句意確定最終的答案．

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