单选题
Part of the lake has been polluted. You can see the water is covered with ______ oil.
A、
a coat of
B、
a story of
C、
a film of
D、
a pad of
【正确答案】
C
【答案解析】
[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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