My father has left for Shanghai and he said he would e back ________.A.as fast as possibleB.as quick as possibleC.as soon as possibleD.as early as possible
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C解析as...as possible意为“尽可能，尽量”按题意，指时间，不指动作，排除A、B，early表示的“早”是指比一段时间或指定时间先一点。soon则表示“不久”，指在一段相对短的时间之后。