—The experiment is of particular importance.    —I see. We will carry on with it ________ we can get enough money.
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A
unless
B
though
C
whether
D
until
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  I have to go on,________difficulties I will meet.
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A
whatever
B
however
C
whoever
D
what
He asked me, “Did you see my sister last night?” ----He asked me __________ 
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A
if I had seen his sister the night before.
B
whether I had seen your sister the night before.
C
did I have seen his sister the night before.
D
that I saw his sister the night before.