【題目】Now all passengers show their ID cards and go through the safety check before they take a train.

A.would B．may C．could D．must

【答案】D

【解析】

試題分析：句意：現(xiàn)在所有的乘客必須出示身份證并通過安檢，才能上火車。A.would愿，要；B．may可以；C．could可以，表示許可；可能，表示肯定的推測；D．must必須。旅客必須出示身份證并通過安檢才能上火車，必須：must。故選D。

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