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The little boy is dirty from head to foot because he______in the mud all morning.
A.has played  B.is playing
C.has been playingD.was playing
C
 从is dirty from head to foot和all morning判断应用一直在玩。现在完成时态和现在完成进行时态都是说明动作由过去开始,该动作延续到现在。
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