Question

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 playing	D．was playing

Answer 1

C　

由“…is dirty”和“all morning”可知，小孩一直在玩。过去的动作一直延续到现在并且还在进行应用现在完成进行时表示。