She decided to take a second course since she______the first one.

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问题 She decided to take a second course since she______the first one.

选项 A、has completed
B、is completing
C、had completed
D、will complete

答案C

解析句意：她决定再选一门课，因为她已经完成了第一门课程。本题考查谓语动词的时态。since引出表示原因的状语从句。因为从句动作complete发生在主句动作decide之前，主句用过去时，从句应用过去完成时。故选C。

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