问题
选择题
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
答案
答案：B
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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
答案：B