OG11-34

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

OG里说E such as light is not paralle to unobtrusive.这2个东东怎么被说成是并列了呢？

笔误，不要管它。

D和E唯一的区别在哪里，OG应该要强调的是那个区别，而不是这个such as lights

这里选D的原因就是因为people tend to overstimate the amount of energy.....and understimate that,这里的that等于the amount of energy.

E不平行

OG里说E such as light is not paralle to unobtrusive.这2个东东怎么被说成是并列了呢？