we must cook the food a very high temperature for a long time . A.at B.to C.for D.in

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we must cook the food a very high temperature for a long time . A.at B.to C.for D.in
we must cook the food a very high temperature for a long time . A.at B.to C.for D.in

we must cook the food a very high temperature for a long time . A.at B.to C.for D.in
可能是A吧.

​we must cook the food a very high temperature for a long time . A.at B.to C.for D.in

we must cook the food a very high temperature for a long time . A.at B.to C.for D.in