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

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问题 The walls are made of hollow concrete blocks.

选项 A. big
B. bng
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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