Several exciting new pieces of equipment ______in our gymnasium, and we invite y

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问题 Several exciting new pieces of equipment ______in our gymnasium, and we invite you to come and try them out at no cost during the next week.

选项 A、install
B、installed
C、have installed
D、have been installed

答案 D

解析 install是表示“安装；设置”的及物动词。但横线后并没有宾语，只有地点状语in ourgymnasium。主语new pieces of equipment相当于install的宾语，因此本句应构成被动语态。答案是(D)have been installed。

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