The little boy is dirty from head to foot because he ______ in the mud all morning.
A．has played 　B．has been playing
C．is playing　D．was playing
B
考查時(shí)態(tài)。句意：因?yàn)樗麄�(gè)上午都在泥中玩耍，這個(gè)小男孩從頭到腳都很臟。結(jié)合語境可知從句中描述的是現(xiàn)在已經(jīng)完成的過去正在進(jìn)行的動(dòng)作故用完成進(jìn)行時(shí)態(tài)，選B。
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