【題目】They have waited for three ________ before going back to see the professor. (month)

【答案】months

【解析】

句意:他們在回去見教授之前已經(jīng)等了三個月。

根據(jù)“for three”可知表示的是一段時間,用可數(shù)名詞month的復(fù)數(shù)形式months。故答案為months

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