问题
选择题
. The little boy is dirty from head to foot because he ___ in the mud all morning.
A．had played
B．has played
C．was playing
D．is playing
答案
答案：C
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. The little boy is dirty from head to foot because he ___ in the mud all morning.
A．had played
B．has played
C．was playing
D．is playing
答案：C