The point ______ water boils is called boiling point.A、whenB、thatC、at whichD、

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问题 The point ______ water boils is called boiling point.

选项 A、when
B、that
C、at which
D、for

答案 C

解析 句意:水沸腾的那一时刻叫沸点。point: (时间的)点;(特定)时刻;瞬间:It was a turning point in his career. 这是他事业上的转折点。At the point he got up and left the room. 此时他站起来,离开了屋子。
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