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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