【題目】It is (believe) that they finished the hard work in such a short time.

【答案】unbelievable
【解析】句意:他們在這么短的時間內(nèi)完成了這項艱難的工作,真是難以置信。 believe動詞,相信; believable形容詞,可信的;unbelievable形容詞,難以置信的。 故填unbelievable。

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