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单项选择 适中0.65 引用2 组卷112
Before taking a plane at the airport, all passengers _______ go through safety check.
A.canB.mustC.mayD.could
15-16六年级下·上海浦东新·期中
知识点:couldMaymustmust表示必须 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!