(单选题) The little boy is dirty from head to foot because he ______ in the mud all morning.(本题3.0分) A、 has played B、 is playing C、 has been playing D、 was playing

(单选题) The little boy is dirty from head to foot because he ______ in the mud all morning.(本题3.0分)
A、 has played
B、 is playing
C、 has been playing
D、 was playing

出自：河北建筑工程学院-大学英语1

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