____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
#98193
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
The composers soon began to write musical dramas about Bible stories ______ in church.
#98725
A
to perform
B
performing
C
to be performed
D
be performed
_______ from father to son, the music has not changed for centuries.
#90655
A
Passing
B
To pass
C
Having passed
D
Passed
_________ his membership card, Tim decided to make a phone call to check whether there was something wrong.
#95793
A
Not having received
B
Not to receive
C
Not received
D
Having not received
To my surprise, he turned up in the room without ___.
#97748
A
noticed
B
being noticed
C
noticing
D
to be noticed
I had a busy and tiring weekend because ______ the house for the Christmas cost me a whole day．
#89342
A
decorating
B
to decorate
C
decorated
D
decorate