【題目】It’s believed that environment still________ (remain) one of the biggest problems for the whole world.

【答案】remains

【解析】

句意:人們認(rèn)為環(huán)境仍然是全世界最大的問題之一。

此處缺謂語動(dòng)詞,句子是一般現(xiàn)在時(shí)態(tài);名詞environment是第三人稱單數(shù),謂語動(dòng)詞用第三人稱單數(shù)形式remains。故答案為remains。

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