问题
选择题
The old couple were surprised at ________ by itself. [ ]
A. the lost dog returned
B. the dog lost returned
C. the lost dog returning
D. the dog lost returning
答案
答案：D
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The old couple were surprised at ________ by itself. [ ]
A. the lost dog returned
B. the dog lost returned
C. the lost dog returning
D. the dog lost returning
答案：D