_____howplantswererelatedwasacomp

发布时间：2020-07-11 05:24:05

_____ how plants were related was a plex and strange thing before Linnaeus developed his system.













A.To having shown












B.Shown











C.Show











D.Showing

网友回答

D解析showing为动名词，后带一个宾语从句，构成动名词短语作句子的主语。
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