In 1965 a new Voting Rights Bill became law all black people had the right to vote from

问题补充：

In 1965, a new Voting Rights Bill became law, all black people had the right to vote from then on.

A. by which

B. that

C. by what

D. which

答案：

(答案→)A. by which

B. that

C. by what

D. which

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