20．One of our rules is that every student_____ wear school uniform while at school．（　�。�
A．mightB．couldC．shallD．will

分析 我們學(xué)校的規(guī)章制度之一是，在學(xué)校里每個(gè)學(xué)生都必須穿校服．

解答 答案：C，考查情態(tài)動(dòng)詞的用法，may （not）/might （not）表達(dá)一種不太把握的推測，意為"或許，可能"；might的語氣比may較婉轉(zhuǎn)．could用于肯定句中表達(dá)推測時(shí)，語氣比may/might更弱．shall用于第一和第三人稱，常用于疑問句中，用來征求對方意見．用于第二和第三人稱，表示命令、威脅、警告、允諾等．will 表示現(xiàn)在的習(xí)慣性動(dòng)作或狀態(tài)，用于各種人稱，表示 意志、意愿、決心、允諾，shall可以用于法律，條款，規(guī)定中表示必須遵守的行為，故答案為C．

點(diǎn)評 考查情態(tài)動(dòng)詞的用法，應(yīng)辨析各個(gè)情態(tài)動(dòng)詞的用法，再結(jié)合句子對答案進(jìn)行確定．

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