We should open the windows often to let ________ in.

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问题 We should open the windows often to let ________ in.

选项 A、the fresh air
B、fresh air
C、a fresh air
D、fresh the air

答案B

解析考查冠词。物质名词、抽象名词在用来表示一般概念时通常不加冠词，因此本题的答案应该是B。

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专业英语四级

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