Part of the lake has been polluted. You can see the water is covered with ______

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问题 Part of the lake has been polluted. You can see the water is covered with ______ oil.

选项 A、a coat of
B、a story of
C、a film of
D、a pad of

答案 C

解析 a coat of一层……涂层；a story of一层……楼；a film of一薄层……；a pad of一层……垫层。根据句意，C最合适。

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Partofthelakehasbeenpolluted.Youcanseethewateriscoveredwith______