--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
---It’s difficult for the villagers to cross the river. ---I think a bridge______ over the river.
#44765
A
should be built
B
is being built
C
has been built
D
was built
Zhengzhou will be more and more convenient when Zhengzhou Subway_____ in two years.
#44912
A
is completed
B
will be completed
C
will complete
D
has completed
---Mum, may I go out to play football this afternoon? ---You can if your homework .
#44800
A
is done
B
will do
C
has done
D
will be done
----Doctors, it seems that you like to work with animals.----Yes, I think animals should ______ as our friends.
#44723
A
regard
B
be regarded
C
be regarding
D
are regarded
I think students _____ to do homework with friends.
#44494
A
should allow
B
should be allowed
C
were allowed
D
must be allowing