________ a two-year period, Nancy became addicted to painkillers （止疼药）.
#34784
A
Beyond
B
Above
C
Since
D
Over
推荐题目
You shall get a film ticket free _______ you use your credit card twice this month.
#31867
A
until
B
since
C
if
D
unless
You’ll start having positive results you replace negative thoughts with positive ones .
#30852
A
since
B
unless
C
until
D
once
They were still working in the fields __ it had got dark.
#79700
A
even if
B
as if
C
in so far as
D
so that
the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks．
#31066
A
How
B
Because
C
If
D
While
What a great weight I felt taken off my mind ________ I heard I had passed the College Entrance Examination!
#80203
A
while
B
the moment
C
until
D
before