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12、___________ a plane flew by, but mostly the sky remained clear.

A.In time                                                      B.On time              

C.From time to time                           D.At the same time

12、C

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___________ a plane flew by, but mostly the sky remained clear.

A.In time                                                      B.On time              

C.From time to time                           D.At the same time

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