is known to all that Taiwan is part of China and it shall not be separated from the mainland.

  A. That         B. As           C. It             D. What

       is known to all that Taiwan is part of China and it shall not be separated from the mainland.

  A. That         B. As           C. It             D. What

____ is known to all ___ Taiwan is ___ of China.

A. As, that, a part        B. As, which a part C. It, which, a part D. It, that, a part