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It happened ____ the Long March.          

A. during           B.in              C.at             D.for

It happened ____ the Long March.          

A. during           B.in              C.at             D.for

It happened ____ the Long March.          

A. during           B.in              C.at             D.for

It happened ____ the Long March.          

A. during           B.in              C.at             D.for

It happened ____ the Long March.          

A. during           B.in              C.at             D.for