---when _______the telephone________，do you know?---Yes．In 1876．
#39777
A
was，invented
B
are；invented
C
did；invent
D
had，invented
推荐题目
What did you buy during your last vacation? I __________ a hat.
#42531
A
buy
B
buyed
C
bought
D
was buy
-This problem is very difficult. -I know,but Jack has working it out.
#38799
A
succeed in
B
succeeds in
C
succeeding in
D
succeeded in
--- Why not go to see the dolphin show with me?---Because I _____ it.
#40623
A
saw
B
will see
C
see
D
have seen
I ________ when the UFO landed.
#42296
A
am watching TV
B
was watching TV
C
have watched TV
D
watched TV
—What were you doing at this time yesterday?—We _______ in the classroom.
#39914
A
read
B
were reading
C
are reading
D
was reading