The how to book can be of help to______  wants to do the job.     
#74293
A
who
B
whomever
C
no matter who
D
whoever
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_____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
What ______ you ______ when you father came back?
#41367
A
did, do
B
are, doing
C
were, doing
D
do, do