13．-Do we have to buy more drinks for the party？
--I don't think you do．We have prepared a whole fridge of them．Theymustbe enough．

分析 -我們必須為派對買更多的飲料嗎？
-我認為你沒必要，我們已經(jīng)準備了一冰箱的（飲料），它們一定夠了．

解答 答案：must
根據(jù)前面的"我認為你沒必要，我們已經(jīng)準備了一冰箱的"可知回答者覺得一冰箱的飲料"一定"夠了．故本題答案為must"一定；必須"這一情態(tài)動詞．

點評 本題考查單詞填空，做此類題目時一定要仔細分析句子結(jié)構(gòu)并根據(jù)句意確定所填詞及其正確形式．

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