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
— Why is the librarian looking so hard at me?— You ____ to read aloud in the reading room 
#104724
A
don’t suppose
B
haven’t supposed
C
are not supposed
D
were not supposed
The little boy is dirty from head to foot because he______in the mud all morning.
#104172
A
has played  
B
is playing
C
has been playing
D
was playing
It was for the first time that the two countries ______ an agreement.
#100479
A
reached
B
have reached
C
had reached
D
will reach