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【单选题】

— Could you please cut the price a little?
— Er…_____ you buy more than ten.
[ ]

A.
even if
B.
so long as
C.
in case
D.
as soon as
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参考解析:
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举一反三

【单选题】Black clouds had completely ___ the sun.

A.
blocked off
B.
broken out
C.
blocked out
D.
broken off

【单选题】Every possible means ____, but none ____ successful.

A.
has tried; has proved
B.
tried; proves
C.
has been tried; proves
D.
is being tried; is proved