The authorities spend a lot of money______keeping the streets and parks clean.A、

游客2025-03-13 30

问题 The authorities spend a lot of money______keeping the streets and parks clean.

选项 A、in
B、on
C、up
D、out

答案 A

解析 spend…in doing sth．是固定结构，表示“花钱或时间做某事”。

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