Designers generally have the area constructed so that the waste goes out in stages.

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问题 Designers generally have the area constructed so that the waste goes out in stages.

选项 A、set out
B、set up
C、set back
D、set on

答案B

解析 set out：起程，出发；set up：建立；set back：使退步；set on：攻击。题中construct意为“建造”，故选B。

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