. In crowded places like airports and railway stations, you __________ take care of your luggage.
A．canB．may
C．mustD．will
C。
must在此表示“必須”。句意為：在像機(jī)場(chǎng)和火車站這樣的比較擁擠的地方，你必須要看好自己的行李。
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