20. Consumers may not think of household cleaning products to be hazardous substances，but many of them can be harmful to health，especially if they are used improperly．
(A) Consumers may not think of household cleaning products to be
(B) Consumers may not think of household cleaning products being
(C) A consumer may not think of their household cleaning products being
(D) A consumer may not think of household cleaning products as
(E) Household cleaning products may not be thought of by consumers，as
答案是D，想问如果把D的a consumer换成consumers可不可以？
22．In recent years cattle breeders have increasingly used crossbreeding，in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.
(A) in part that their steers should acquire certain characteristics
(B) in part for the acquisition of certain characteristics in their steers
(C) partly because of their steers acquiring certain characteristics
(D) partly because certain characteristics should be acquired by their steers
(E) partly to acquire certain characteristics in their steers
答案是E，请问：如果把D改成partly because their steers should acquire certain characteristics.可不可以？
27．Minnesota is the only one of the contiguous forty-eight states that still has a sizable wolf population, and where this predator remains the archenemy of cattle and sheep．
(A) that still has a sizable wolf population，and where
(B) that still has a sizable wolf population，where
(C) that still has a sizable population of wolves，and where
(D) where the population of wolves is still sizable；
(E) where there is still a sizable population of wolves and where
答案是E，请问：前面有the only，后面不是要用that来引导吗？这一句中用where又是什么原因呢？
谢谢！
20. 改成customers的话可能会引起后面的them指代不清吧, 不太确定
22. 不行. 这样改的话颠倒了主次. E是表示杂交的目的; D表示杂交产生的结果, reverse后还是表示结果
27. where 修饰M
看了第27题，有点疑问。
where的用法都有什么？可以引导什么句子啊？
说到我痛处了, where的用法没有总结过;(
在这里引导定语从句
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