Tom said he had been working for three hours, ,evidently, was untrue.A. heB. thisC. itD.

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A. he
B. this
C. it
(答案→)D. which
解析：which是引导定语从句, which指代前面句子的整个内容。evidently为插入语。若空格前加上并列连词but, 其后应是个独立的分句, 则要选C项it。