选择填空: They've learned a lot they entered the middle school. [ ] A. until B. when C. since D. after 题目和参考答案——青夏教育精英家教网——

题目内容

选择填空:

They've learned a lot ______ they entered the middle school.

[　　]

A. until　　B. when　　C. since　　D. after

答案：C

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