14．You            afraid of doing homework．You know，it's easy．Just be careful．（　　）
A．don't have toB．have to be
C．don't haveD．don't have to be

分析 你不必?fù)?dān)心做家庭作業(yè)．你知道，它是很簡單的，只要你細(xì)致些．

解答 正確答案：D．have to表示必須，不得不，其否定式是don't have to，表示不必．根據(jù)it is easy．Just be careful．可知家庭作業(yè)并不難，只要細(xì)致就可以做好，所以不必?fù)?dān)心作業(yè)，故選擇D．be afraid of doing sth．表示害怕/擔(dān)心做某事．

點(diǎn)評 本題考查情態(tài)動詞have to，基礎(chǔ)題，掌握其基本用法，根據(jù)題干即可作出選擇．

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