it is in 1960 ____Chinese first put out flag on Mount Huang A when B that C which 选哪个?为什么

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it is in 1960 ____Chinese first put out flag on Mount Huang A when B that C which 选哪个?为什么
it is in 1960 ____Chinese first put out flag on Mount Huang A when B that C which 选哪个?为什么

it is in 1960 ____Chinese first put out flag on Mount Huang A when B that C which 选哪个?为什么
B 强调句型