______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．
#33803
A
What, how
B
That, how
C
What, what a
D
That, what
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________ time went by, small clever animals covered the earth and have become the most important animals on the planet.
#31981
A
With
B
As
C
Because
D
During
A good friend of mine from I was born showed up at my home right before I left for Beijing．
#80680
A
how
B
whom
C
when
D
which
Mary got up early________ she could prepare breakfast for her brother.
#30754
A
so that
B
although
C
as if
D
even if