题目类型：Writing > Improving Sentences
Part or all of the following sentence is underlined； beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives， select choice A.
The finest quality raw silk comes from the commonly domesticated silkworm， Bombyx mori， it feeds on the leaves of the mulberry tree.
(A) it feeds
(B) feeding
(C) they feed
(D) which feeds
(E) having fed
答案：D
解析：
Choice (D) is correct. It avoids the comma splice error of the original by providing the appropriate modifying phrase “which feeds on the leaves of the mulberry tree.”
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