题目内容：
请在（60）处填上最佳答案。
A．about B．to
C．by
D．on
参考答案：
答案解析：
单选题：请在（60）处填上最佳答案。
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B．to
C．by
D．on
B．to
C．by
D．on
Paragraph 3__________ .
Paragraph 3__________ .
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