Question

________ was known to us all that Johnson had broken his promise ________ he would give each of us a small gift.

A．As；which	B．What；that
C．It；that	D．It；which

Answer 1

C

第一空it作形式主语，真正的主语是that Johnson...；第二空that引导的是同位语从句，用以解释promise的内容。