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In crowded places like airports and railway stations, you __________ take care of your luggage.

A. can B. mayC. must  D. will

C。


解析:

must在此表示“必须”。句意为:在像机场和火车站这样的比较拥挤的地方,你必须要看好自己的行李。必须”。句意为:在像机场和火车站这样的比较拥挤的地方,你必在此表推测,“can+have+过去分词”表示对过去情况的推测,主要用于否定式或疑问句中。句意为:我的MP4不在包里,我会把它放到哪里去了呢?

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