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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

试题分析:can能,会;would将,意愿;must必须;might也许。句意:报警电话的接线员必须保持镇静并且确保他们得到的需要帮助的有关信息发出去。根据句意应选C。
点评:情态动词是高中阶段必须掌握的一个知识点,内容多,需要考生注意它们的用法及区别。
即学即练:If you____go, at least wait till the rain stops.
A. can              B. would         C. must             D. might
解析:C 句意:如果你坚持要走,至少也要等雨停了再走。  
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