4. According to the latest study of IUCN, over one-fourth of the plants on the earth ______ already been extinct and will never be seen again.
(A) has
(B) have
(C) having
(D) had
詳解 (共 1 筆)
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one-fourth of the pl...
私人筆記 (共 1 筆)
未解鎖
解釋: 句子主詞是: over on...