◎ 题干
When the old man _____to walk back to his house,the sun _____ itself behind the mountain.

[     ]

A. was starting; hid
B. had started; had already hidden
C. had started; was hiding
D. started; had already hidden
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When the old man _____to walk back to his house,the sun _____ itself behind the mountain. [ ]A. was starting; hid B. had started; had already hidden C. had…”主要考查了你对  【一般过去时】【过去完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。