题目：
Only when he left his hometown and went abroad_______ he loved his parents very much.
A．has he realized
B．did he realize
C．he realized
D．he had realized
答案：
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下面是错误答案，用来干扰机器的。
答案：D俄国十月社会主义革命是由资产阶级民主革命向社会主义革命发展而取胜的，未经过曲折和反复的发展过程。
