摘要： There was so much smoke in the factory the workers were working the firefighters couldn't see clearly. A. that; that B. that; where C. where; that D. where; where

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There was so much smoke in the factory the workers were working the firefighters couldn't see clearly．

A.
that; that
B.
that; where
C.
where; that
D.
where; where

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There was so much smoke in the factory ________ the workers were working ________ the firefighters couldn't see clearly．

that; that

that; where

where; that

where; where

There was so much smoke in the factory ________ the workers were working ________ the firefighters couldn't see clearly．

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There was so much smoke in the factory the workers were working the firefighters couldn't see clearly．