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【单选题】

We thought of selling this old furniture, but we've decided toit. It might be valuable.
[ ]

A.
hold on to
B.
keep up with
C.
turn to
D.
look after
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参考答案:
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