____ you call me to say you are not coming, I will see you at the theatre at five this afternoon．
#30801
A
Though
B
Whether
C
Unless
D
Until
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It doesnt matter ________ you pay by cash or credit card in this store.
#30822
A
how
B
whether
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what
D
why
Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
#30282
A
before
B
as
C
unless
D
in case
If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.
#80352
A
even if
B
so long as
C
if
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as
A warm thought suddenly came to me _______ I might substitute the hero to buy some flowers for his mother’s 60th birthday.
#33893
A
if
B
when
C
that
D
which