If nature does not provide man with the necessary material,it is the laboratory______he will turn tofor it.

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问题 If nature does not provide man with the necessary material,it is the laboratory______he will turn tofor it.

选项 A、where
B、which
C、that
D、what

答案C

解析 如果自然界无法提供人类所需的材料,人类会求助于实验室。本句是一个强调句型,其结构为“It+be+强调部分+that/who+(从句)”,根据句意,本句的强调部分是“the laboratory”,正常语序下它应放在“turn to”的后面,即:He will turn to the laboratory for it.因此,本句的正确答案是C。
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