My mother _____ all the cleaning for my family, but recently she has been too busy teaching to do it. 
#99234
A
will do
B
is doing
C
does
D
had done
推荐题目
The little boy is dirty from head to foot because he ________ in the mud all morning.
#104514
A
has played
B
is playing
C
has been playing
D
was playing
Two building workers got seriously wounded when the stadium _______. 
#99780
A
was built
B
was being built
C
built
D
is being built
—— Alice came back home the day before yesterday. —— Really ? Where _____ ? 
#104637
A
has she been
B
had she been
C
has she gone
D
had she gone