考试
2020-03-16 06:48:59

4409 ______conservation become

题目描述

______conservation becomes a matter of policy, the majority of our attractive wild plants



______conservation becomes a matter of policy, the majority of our attractive wild plants and flowers will be under threat of extinction.

A.If

B.Whenever

C.Whether or not

D.Unless

请帮忙给出正确答案和分析,谢谢!

答案解析

D本题考查条件状语从句,据题意,用Unl

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