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  3. She decided to take a second course since she ______the first one.

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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