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 since引出表示原因的状语从句。因为已经完成一门课程后,决定再选一门课程,主句用过去时,从句用过去完成时。
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