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

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

admin2020-12-24  17
问题 The 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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