--When _____ the abacus _____? -- In the sixth century by the Chinese people.
#44867
A
is, invented
B
did, invent
C
was, invented
D
does, invent
推荐题目
— Were you allowed to go to your cousin’s birthday party?—No, I .
#44653
A
am not invited
B
haven’t invited
C
didn’t invite
D
wasn’t invited
Liu Xiang is well known all over the world, he ____ to appear in films.
#44957
A
asks
B
is asked
C
asked
D
will ask
The sick boy ____________ to hospital by the police yesterday.
#44521
A
is taken
B
was taken
C
takes
D
took
The television ________. It doesn’t work now.
#44544
A
must repair
B
was repairing
C
must be repaired
D
has repaired