________ repeatedly, the problem still appeared in the beginners’ homework.
#100762
A
Explaining
B
Having explained
C
Having been explained
D
To be explained
推荐题目
 Many kinds of help ________ by plane or by train to the area ever since the earthquake hit it.
#103062
A
had been offered
B
have been offered
C
are offered
D
were offered
I hope _____ the job she's applied for (申请) .  
#104930
A
she's going to get
B
she'll get
C
she is to get
D
she decides to get