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

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

选项 A、If
B、Whenever
C、Whether or not
D、Unless

答案D

解析 本题考查条件状语从句,据题意,用Unless。题意为,如果保护不能成为一项政策,我们大部分的可爱的野生植物和花卉将有灭绝的危险。
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