In addition to having more protein than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.
(A) the protein in rice is higher quality than that in
(B) rice has protein of higher quality than that in
(C) the protein in rice is higher in quality than it is in
(D) rice protein is higher in quality than it is in（B）
(E) rice has a protein higher in quality than
答案选B，但搞不清楚B中的比较结构
另外为什么E会错，rice与wheat作比较省去has啊？？
In addition to having more protein than wheat does, 此处的比较的是rice 和 wheat的protein含量。Rice has protein of higher quality than that in wheat 比较的是protein质量方面的差异， 所以B项中用that 代替protein。 E项中的补出has表示比较的是主语，但是此处比较的是protein的质量，故不正确。
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