The theory wasn’t accepted by many people when it was first but it proved to be true as

问题补充：

The theory wasn’t accepted by many people when it was first , but it proved to be true as time went by.

A. put forward

B. relied on

C. set out

D. given off

答案：

(答案→)A. put forward

B. relied on

C. set out

D. given off

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