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【单选题】
Measures have been taken to clean up the lake,but it will be some time________the situation improves.
[ ]
A.
although
B.
before
C.
unless
D.
when
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参考解析：
刷刷题刷刷变学霸
举一反三
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A.
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A.
picked up
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pick up
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sceptical
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A.
are having; will start
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A.
wiped out
B.
stood out
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D.
put out
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A.
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B.
To observe
C.
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D.
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