He two tickets for us before he arrived at the entrance of the cinema. A. had reservedB.

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(答案→)A. had reserved
B. has reserved
C. was reserving
D. has been reserving
解析：考查时态。既有：在他到达电影院门口之前，他已经给我们订了两张票。发生在过去动作之前的动作，简称“过去的过去”，应该使用过去完成时，根据过去式arrived可知，发生在它之前的动作，使用过去完成时，故选A。