It took several hundred years ______ paper-making spread to western countries.
#33423
A
when
B
before
C
after
D
since
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．______ the satellite launch drawing near, the research workers put their hearts to the test and always stayed up late.
#33637
A
As
B
Because
C
With
D
While
Mount Wuyi is such an attractive place of interest ___everyone likes to visit.
#34303
A
that
B
as
C
which
D
what
_______environmental damage is done, it takes many years for the ecosystem to recover.
#31390
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Even if
B
If only
C
While
D
Once