The little boy is dirty from head to foot because he ________ in the mud all morning.
A．has playedB．is playing
C．has been playingD．was playing
C　
由“…is dirty”和“all morning”可知，小孩一直在玩。過去的動作一直延續(xù)到現(xiàn)在并且還在進行應用現(xiàn)在完成進行時表示。
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