The valley was so deep that it had been ten seconds _________the stone feel off to the bottom. A sin...
2023-01-23 20:22:20 182次 2010年黑龙江省高二下学期期中考试英语 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The valley was so deep that it had been ten
seconds _________the stone feel off to the bottom.
A
since B
before C
when
D until
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