If nature does not provide man with the necessary material, it is the laboratory ____ he will turn t...
2023-01-20 16:06:33 137次 2010-2011学年北京市东城区高三上学期英语综合练习（一） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
If nature does not
provide man with the necessary material, it is the laboratory ____ he will
turn to for it．
A．where B．that C．which D．what
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