--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
Mr. Chen has a loud voice. His voice can ______ clearly, even in that big classroom.
#44953
A
be heard
B
hear
C
be hearing
D
have heard
–Lots of trees and flowers ________ on both sides of the road last year. --Oh, _______ beautiful they are!
#44520
A
have been planted; how
B
were planted; what
C
were planted; how
D
have been planted; what
—All the happiness was_________ when we heard the bad news from Yushu．—But what happened to you ?
#44999
A
disappeared
B
missed
C
lost
D
gone
What ______you do if you _______ in Grade 7 now?
#44518
A
could, are
B
would, are
C
could, was
D
would, were