--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
The students are ______ to hand in the exercises before class.
#44540
A
hoped
B
suggested
C
agreed
D
expected
--- How beautiful your school is！-- Yeah, it to be one of the most beautiful schools in our city.
#44643
A
thinks
B
is thought
C
isn’t thought
D
doesn’t think
— It’s difficult for the village children to cross the river for school.— I hear a new bridge _______ over the river in a year.
#44816
A
was built
B
is being built
C
has been built
D
will be built
If your homework ________ , you may watch TV for half an hour.
#45077
A
is finished
B
will be finished
C
has finished
D
will finish
At that moment，he was last __________ the room with his friends．
#44658
A
seen leaving
B
to see leave
C
seen to leaving
D
to see to leave