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  3. 丁he walls are made of hollow concrete blocks.A big B long C new D empty

丁he walls are made of hollow concrete blocks.A big B long C new D empty

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问题 丁he walls are made of hollow concrete blocks.
选项 A big
B long
C new
D empty
答案D
解析hollow是“空心的”意思，如：a hollow tree, a hollow pipe。这里可以用empty来替换。
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