【单选题】Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.
A、that are
B、which is
C、 those are
D、as are
网考网参考答案:D
网考网解析:
暂无解析
document.getElementById("warp").style.display="none";
document.getElementById("content").style.display="block";
查看试题解析出处>>
发布评论 查看全部评论