牛牛帮忙分析下~~~OG紫34题答案解析

8. Lacking information about energy use, people tend to overestimate the amount of energy used by equipment, such as lights, that are visible and must be turned on and off and underestimate that used by unobtrusive equipment, such as water heaters.
(A) equipment, such as lights, that are visible and must be turned on and off and underestimate that
(B) equipment, such as lights, that are visible and must be turned on and off and underestimate it when
(C) equipment, such as lights, that is visible and must be turned on and off and underestimate it when
(D) visible equipment, such as lights, that must be turned on and off and underestimate that
(E) visible equipment, such as lights, that must be turned on and off and underestimate it when

答案选D没问题，双平行也明白。

但是新版OG11解析说：A,that are visible is not parallel to unobtrusive
                                      B,C,E中such as lights is not parallel to unobtrusive

ETS是怎么思考的？他们为什么会认为A中谓语为are就想到that are visible与unobtusive比较?        B.C.E中将that的定从改为状从就想到是such as lights 与unobtusive比较，而不是visible与unobtusive比较？

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谢谢楼上2位，第一个问题明白。clause not parallel to adj

但第二个问题仍然迷糊。

我将错误选项E带入原句，这样分析时思路能清晰些

 Lacking information about energy use, people tend to overestimate the amount of energy used by
        visible equipment, such as lights, that must be turned on and off and underestimate it when used by
        unobtrusive equipment, such as water heaters.

很清楚能看出红色字平行错误，蓝色字平行

但是ETS居然会想出，插入语such as lights（粉红色字体）与unobtrusive平行？？  难道是ETS分析错误？

我只是想学习ETS分析题的思路~~~~不要怪我太钻牛角尖呵。。。。。请牛牛指点~~~！！！