Emergency line operators _______ always stay calm and make sure that they get all the information they need to send help.
A．canB．wouldC．mustD．might
C

試題分析：can能，會(huì)；would將，意愿；must必須；might也許。句意：報(bào)警電話的接線員必須保持鎮(zhèn)靜并且確保他們得到的需要幫助的有關(guān)信息發(fā)出去。根據(jù)句意應(yīng)選C。
點(diǎn)評(píng)：情態(tài)動(dòng)詞是高中階段必須掌握的一個(gè)知識(shí)點(diǎn)，內(nèi)容多，需要考生注意它們的用法及區(qū)別。
即學(xué)即練：If you____go, at least wait till the rain stops.
A. can              B. would         C. must             D. might
解析：C 句意:如果你堅(jiān)持要走，至少也要等雨停了再走。  
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