The spiny problem we have faced is_________we can prevent and cure the loss of soil and water.

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问题 The spiny problem we have faced is_________we can prevent and cure the loss of soil and water.

选项 A、what
B、when
C、how
D、where

答案C

解析 本题考查表语从句。句意为“我们一直面临着一个棘手的问题,即如何预防并治理水土流失”。连接副词how引导表语从句并在从句中作方式状语。故本题选C。
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