问题

The conversations which English people hold about the weather do not as a rule leave the p

The conversations which English people hold about the weather do not as a rule leave the participants any the wiser; only on rare occasions can information be said

A．is exchanged

B．to be exchanged

C．to have been exchanged

D．has been exchanged

请帮忙给出正确答案和分析，谢谢！

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