It is the responsibility of agents at the airline’s check-in counters to have ba

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问题 It is the responsibility of agents at the airline’s check-in counters to have baggage tags on hand for travelers who ______them.

选项 A、requesting
B、request
C、requests
D、to request

答案 B

解析关系代词作主语的定语从句“who______them”中缺少谓语动词，故动词(B)和(C)为备选答案。主格关系代词who所代替的先行词travelers为复数形式，所以谓语动词要用原形，故(B)request为正确答案。

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