it was about 20000years ago that the Chinese first made paper

问题描述:

it was about 20000years ago that the Chinese first made paper
是强调句吗,恢复是什么样

Chinese first made paper是主句,about 20000 years ago是时间状语.
因此恢复应该是:
Chinese first made paper about 20000 years ago.
或About 20000 years ago,Chinese first made paper