Dump sewage into oceans and rivers is a serious form of pollution.

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问题 Dump sewage into oceans and rivers is a serious form of pollution.

选项 A、Having dumped sewage
B、Being dumped sewage
C、Dumped sewage
D、Dumping sewage

答案D

解析本题考查动名词作主语。句意为：把污水排入海洋和河流是一种严重的污染形式。句中已经有谓语了，所以只能用动名词作主语。所以，答案是D。

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