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
 從is dirty from head to foot和all morning判斷應(yīng)用一直在玩�，F(xiàn)在完成時(shí)態(tài)和現(xiàn)在完成進(jìn)行時(shí)態(tài)都是說明動(dòng)作由過去開始，該動(dòng)作延續(xù)到現(xiàn)在。
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