16. How did the dog perform his duties? A. He had few opportunities to do them. B. He was delighted to show them off. C. He did them quickly to get them over. D. He did his best but was not often successful.

16. How did the dog perform his duties?
A. He had few opportunities to do them.
B. He was delighted to show them off.
C. He did them quickly to get them over.
D. He did his best but was not often successful.

出自：大学英语第二册

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