17．Mom，you promised to read me a story every night as long as I behave well，so you must ______．（　�。�
A．do itB．do reading itC．read a storyD．do reading

分析 媽媽，你答應(yīng)過我只要我表現(xiàn)好，你每晚都會讀故事的，所以你必須做到．

解答 答案：A
must為情態(tài)動詞，后需加動詞原形．如果前面出現(xiàn)一個動詞，后面再次出現(xiàn)則用助動詞do來代替，do it代指前文的read me a story every night，故選A．

點(diǎn)評 本題考查助動詞．考生需掌握do可以代指前文出現(xiàn)的動詞，并要注意有時態(tài)和人稱的變化．

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