（）have been trying every way to keep the balance of nature
（）have been trying every way to keep the balance of nature
A.Man
B.Mankind
C.Human
D.Human beings
A.Man
B.Mankind
C.Human
D.Human beings
英語人氣：195 ℃時(shí)間：2020-05-13 15:40:51
優(yōu)質(zhì)解答
選d!應(yīng)該是集體名詞的考核!前面abc都是集體單數(shù)!后面應(yīng)該跟has
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