单选题：As the mountains were covered with a __________ of cloud, we

题目内容：

As the mountains were covered with a __________ of cloud, we couldn't see tbeir tops. A．coating
B．film
C．veil
D．shade

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答案解析：

Doing your homework is a sure way to improve your test score

Doing your homework is a sure way to improve your test scores, and this is espec

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