—The train is due to leave at 7：50.—________ we fail to arrive there in time?—I'm afraid you'd better go in a hurry.
#29963
A
What if
B
As if
C
Even if
D
Only if
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There are no easy answers to questions brought to us by the rapidly changing world, we can try to turn challenges into opportunities．
#31140
A
so
B
but
C
for
D
then
I was surprised by his words ,which made me recognized ______silly mistakes I had made .
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what
B
that
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how
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which
Wind power is an ancient source of energy _____ we may return in the near future.
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A
to which
B
by which
C
from which
D
on which
___ impressed me most about the woman was that she looked after the old man for twenty years without any complaint.
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That
B
Which
C
What
D
As
He was in great trouble, but he acted _______ nothing had happened.
#33313
A
even if
B
as if
C
unless
D
until