______ trees are cut down in the forests every year.

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问题 ______ trees are cut down in the forests every year.

选项 A、Thousands
B、Thousands of
C、Thousand of

答案B

解析 表示“百(hundred)、千(thousand)”的词语,若前面有具体的数字修饰时不加“s”。hundreds of表示“成百的”,thousands of表示“成千的”,都为固定用法。全句意为“每年有成千的树木被砍伐。”
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