17．While by school rules high school students _________ use cell phones in the school，they can use public phones to keep in touch with friends and family．（　　）
A．mustn'tB．shan'tC．wouldn'tD．mightn't

分析 雖然根據(jù)學校規(guī)定高中學生在學校不允許用手機，他們可以用公共電話與朋友和家人保持聯(lián)系．

解答 答案是B．本題考查情態(tài)動詞shall的用法．情態(tài)動詞shall常常用來表示法律或條文的規(guī)定．根據(jù)句意可知，學校的規(guī)定屬于條文的規(guī)定，所以本題答案選擇B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎(chǔ)上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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