未分类题

______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

A.
A．If
B．Whenever
C．Whether
B.Unless

【参考答案】

D
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......

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