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：考查独立主格结构. As 作为,由于;When当……时；With带有，伴随；If是否，如果。随着陆地侵蚀问题变得更加严重，政府正在寻求新的方法来处理。结合语境可知选C。
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