The main facts in human life are five; birth, food, sleep, love and death. One could increase the number--add breathing for instance--but these five are the most obvious. Let us ask ourselves______our lives.A.they play in what partB.they play what part inC.what part they play inD.in what part they play
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C解析Let us ask ourselves what part they play in our lives. 句意为:让 我们问问自己它们在我们生活中所起的作用。what part they play in our lives是宾语从句。they指代前面提到的 The main facts in human life,即 birth, food, sleep, loveand death。