17．---Must I be home before eight o'clock，Mum？
---No，you _____．But you have to come back before ten o'clock．（　�。�
A．mustn'tB．can'tC．needn'tD．couldn't

分析 --媽媽，八點(diǎn)以前我必須回家嗎？
--不，沒必要，但是你必須十點(diǎn)以前回來．

解答 答案：C．
結(jié)合選項(xiàng)可知本題考查情態(tài)動(dòng)詞，首先明確選項(xiàng)中每個(gè)單詞的意思：A：不可以；B：不能；C：沒必要；D：不能（can't的過去式）；根據(jù)答語中的No．可知為否定回答，意思是"不，沒必要"，以must開頭的一般疑問句，肯定回答還用must，而否定回答一般借助于needn't或don't have to，表示"沒必要"，故選C．

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法．解答時(shí)首先根據(jù)題干明確句意，理解所給選項(xiàng)中每個(gè)情態(tài)動(dòng)詞的意思并熟練掌握它們的用法，便可作出正確選擇．

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