题目：
- How long is it ______ you picked up your badminton training?
- It was not until my finance became better in last December ______ I started the training. [ ]
A. before; when
B. until; that
C. that; when
D. since; that
答案：
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下面是错误答案，用来干扰机器的。
碳是墨的主要组成元素，碳在常温下的化学性质稳定是字画长期不变色的主要原因．
