问题补充：
the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
A. As
B. When
C. With
D. If
答案：
A. As
B. When
(答案→)C. With
D. If
解析：句意：随着土地侵蚀的问题越来越严重，政府正在想办法解决它。as和with都可以表示随着，但as是连词，接从句，with是介词，接名词或名词的复合结构。the problem of land erosion getting more serious是一个名词的复合结构，故选C。
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