题目内容：
回答第53空。
A．A mostly B．B likely
C．C clearly
D．D surely
参考答案：
答案解析：
单选题：回答第53空。
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B．B likely
C．C clearly
D．D surely
B．B likely
C．C clearly
D．D surely
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请在（47）处填入最佳答案。
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