问题

The little boy is dirty from head tofoot because he ___ in the mud allmorning.

A:Sure , it is
B:is playing
C:has been playing
D:was playing

正确答案是：

同类题型

— Can you come to the party tonight?— Sorry,I can’t.________ the boss about something urgent. [ ]

ment I arrived at Hangzhou, WestLake my attention.

She finds hard to finish the work in two days.

下列关于文化常识的解说，正确的一项是

_____you sing and dance at this late hour of the night?-Sorry, I will stop right now.