______ over and over again, but he still couldn’t understand.
#103480
A
Having explained
B
Having been explained
C
Explaining
D
It had been explained
推荐题目
The singer and dancer _____ asked to sing a song in public, and she agreed happily.
#100275
A
is
B
was
C
are
D
were
Being a teacher，she dreamed____turning a deaf-blind creature into a useful human being.
#99286
A
at
B
of
C
on
D
from
—This is the first time I __________ my first picture with my own hands.—It's time that you __________ a picture for me.
#100440
A
took; will take
B
have taken; took
C
took; took
D
will take; have taken
The chief editor demanded that the article immediately.
#103018
A
submitted
B
was submitted
C
submits
D
be submitted