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【题目】All passengers________ through the safety check before they take a plane.

A.mustB.canC.need

【答案】A

【解析】

句意:所有的乘客乘坐飞机以前必须通过安全检查。

must必须;can能够;need需要。根据句意可知乘坐飞机必须过安检,must表必须或必要,故选A

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