John said he had been working in the office for an hour was true.A. heB. thisC. whichD

问题补充：

John said he had been working in the office for an hour, was true.

A. he

B. this

C. which

D. who

答案：

A. he

B. this

(答案→)C. which

D. who

解析：which引导非限制性定语从句，which可指代主句的整个内容，意为“这一点”。