Only after a long chat, _________ that Mr. Smith was in fact a boss of a big factory. ( 章节：6 难度：3)
- A、he realized
- B、he has realized
- C、did he realize
- D、has realized he
正确答案:C
答案解析:有
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Only after a long chat, _________ that Mr. Smith was in fact a boss of a big factory. ( 章节：6 难度：3)
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