I think people must have found it quitedelight when colour TV was first broadcast in1920s.

问题补充：

I think people must have found it quitedelight when colour TV was first broadcast in1920s.

A. 不填; the

B. a; 不填

C. a; the

D. 不填; 不填

答案：

A. 不填; the

B. a; 不填

(答案→)C. a; the

D. 不填; 不填

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