It was said            was how the Chinese first raised silk worms.
A．that what
B．that which
C．that who
D．that that
D
本句中的it為形式主語，真正的主語是后面的由that 引導(dǎo)的主語從句that that was how the Chinese first raised silk worms，在這個(gè)主語從句中，第一個(gè)that 只起引導(dǎo)詞的作用，第二個(gè)that 是指示代詞，作從句的主語。
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