All passengers should present their______documents at the check-in counter.

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问题 All passengers should present their______documents at the check-in counter.

选项 A、boarded
B、boarding
C、to board
D、boards

答案B

解析 document是名词,意思为“文件,文档”,board在这里是动词,意思为“上(船、飞机等)”。为修饰后面的名词documents,只能用board的现在分词或是过去分词。根据句意,这里指的是“登机证件”,所以用现在分词才正确。boarding documents指登机证及护照等相关证件。
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