Several exciting new pieces of equipment ______in our gymnasium, and we invite you to come and try them out at no cost during th

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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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