_________ it takes many years to gain the skills of an expert.
#15083
A
It is well known to us that
B
As is known to us that
C
As we know that
D
That is well known to us
推荐题目
When you’re faced with failure， you need is to take courage and try again．
#14658
A
that
B
all
C
which
D
it
“No bread eaten by man is so sweet as______ earned by his own labour. ”
#14981
A
one
B
that
C
it
D
those