_____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
#73673
A
Having been explained
B
The problem having been explained
C
The problem had been explained
D
Although the problem had been explained
推荐题目
Peter was so excited _____he received an invitation from his friend to visit Wuxi.
#41342
A
where
B
that
C
why
D
when
It is only _______ your heart is really in it _______ you can play your best.
#69243
A
that; that
B
that; when
C
when; that
D
when; when
He fell off the bike ________.
#41254
A
while he rode
B
while he was riding
C
while he is riding
D
while on bike
-- How long do you think it will be ____ the USA recovers from the losses of the financial crisis? -- Perhaps four or five years.
#69307
A
when
B
since
C
that
D
before
Was it through Mary__________ was working at a high school_________ you got to know Bob?
#70221
A
who; who
B
who; that
C
that; that
D
that; where