Experts have been warning___of the health risks caused by passive smoking.A．at a timeB．at one timeC．for some timeD．for the time-高中英语-n多题

◎ 题干

Experts have been warning___of the health risks caused by passive smoking.

A．at a time	B．at one time
C．for some time	D．for the time

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◎ 解析

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◎ 知识点

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