_____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
In South Africa, English is the language ________ black parents wish their children to be educated.
#67140
A
for which
B
that
C
in which
D
when
There came a stranger with his cap pulled over his face, ______ I thought seemed curious about what I was carrying．
#69469
A
that
B
who
C
whom
D
which
People often have this belief ______ development is bad for the environment, but this does not have to be true.
#68261
A
that
B
which
C
where
D
how