4．Shopping online can save much time as you _______ go to a shop or walk around crowded shopping centers．（　　）
A．don't have toB．oughtn't toC．won'tD．mustn't

分析 網(wǎng)購可以為你節(jié)約很多時間，因為你不必要去商店或擁擠的購物中心．

解答 答案：A
根據(jù)題意"as"意為"因為"引導(dǎo)一個原因狀語從句，結(jié)合前句可知，"have to"意為"必須，不得不"故其否定形式符合題目要求．"oughtn't to"意為"不應(yīng)該"，"mustn't"意為"禁止，千萬不要"．

點評 本題考查情態(tài)動詞．學(xué)生在學(xué)習(xí)時要牢記這些情態(tài)動詞的用法，并能注意區(qū)分相近詞的區(qū)別．

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