When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．A．askedB．being as-高中英语-n多题

◎ 题干

When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．

A．asked

B．being asked

C．having asked

D．asking

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◎ 解析

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◎ 知识点

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