--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 sports meeting ________ twice a year in our school.
#44789
A
holds
B
is held
C
held
D
will be held
—Lots of trees and flowers ______ on both sides of Huanshan Road last year. —Oh, that’s beautiful.
#45053
A
are planted
B
were planting
C
were planted
D
have planted
I was told that a film directed by Feng Xiaogang this coming Sunday．
#45046
A
is showed
B
will be showing
C
will show
D
would be shown
It is said that another new underground train ______ not far from the center of the city.
#44837
A
is to be built
B
has built
C
is to build
D
be built