---Has Tom finished his homework?---I don’t know.  But he _________ it the whole morning. 
#41725
A
did
B
does
C
was doing
D
is doing
推荐题目
My brother came back home while I           homework.
#36261
A
am doing
B
did
C
was doing
D
were doing
There ______many restaurants in town, but they _________ eat the food there at first.
#42465
A
used to have, didn’t use to
B
used to have, didn’t used to
C
used to be, didn’t use to
D
used to be, didn’t used to
Do you know        over there?
#39593
A
what happening
B
what was happened
C
what is happening
D
what did happen