【題目】What caused the infectious disease remains ____________ (know). We need to do more research on it.

【答案】unknown

【解析】

句意:引起這種傳染病的原因尚不清楚。我們需要做更多的研究。

根據(jù)句意理解及后句We need to do more research on it.可知,這里表達的是“未知的”,英語是unknown,是一個形容詞,在句中放在remains后面做表語,故答案為unknown。

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