_____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
One of the men held the view ____ the book said was right.
#73075
A
what that
B
what
C
that
D
that what
—Is Paul playing basketball for his school?—Well,he ____.But he has given it up and switched to playing volleyball.
#71724
A
is
B
was
C
has
D
had
Have you ever dreamed of playing in front of thousands of people at a concert, _______everyone is clapping and appreciating your music?
#69116
A
in which
B
for which
C
from which
D
at which