_______ travelling expenses rising a lot, we had to change all our plans for the tour．
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As
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By
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Since
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With
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—When did your cousin begin to show his interest in medicine?—It was a Saturday ___ she noticed her uncle experimenting on a frog in his lab.
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that
B
what
C
when
D
which
When they retire, many people over 60 prefer the houses in the country to spend their remaining years to __________ in a large city.
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it
B
that
C
those
D
which
There’s now a consensus nearly all over the world _____ we’re facing a fragile world peace.
#33571
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where
B
which
C
that
D
what