题目内容
_______ is well known _______ Hong Kong returned to China on July 1st, 1997.
| A．It, that | B．As, / | C．As, as | D．It, which |
A
it 为形式主语，其后的that从句为主语从句。
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A
it 为形式主语，其后的that从句为主语从句。