A deposit of 120 dollars is needed when ______ a room in this hotel.

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问题 A deposit of 120 dollars is needed when ______ a room in this hotel.

选项 A、to reserve
B、reserves
C、reserved
D、reserving

答案D

解析语法题。B从句中缺少主语，而B选项前面需要主语，故排除；同时when引导的状语从句中，动词reserve与空格后的宾语是主动关系，省略了主语“you”．因此要使用现在分词形态。故选D。

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