Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa? 
#84845
A
when
B
that
C
after
D
since
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It is in this laboratory ______ is run by Mr. Wu ______ the experiments are done.
#85126
A
which; that
B
that; which
C
where; that
D
that; where
 It was only with the help of the local guide __________.
#84812
A
was the mountain climber rescued
B
that the mountain climber was rescued
C
when the mountain climber was rescued
D
then the mountain climber was rescued
It was last night ________ I saw the comet.
#84749
A
the time
B
when
C
that
D
which