33．The highway through the rain forest was completed in 1990, _________some animal species have died off.A．by whenB．since thenC．since whenD．by which time-高中英语-n多题

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33．The highway through the rain forest was completed in 1990, _________some animal species have died off.

A．by when

B．since then

C．since when

D．by which time

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◎ 解析

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◎ 知识点

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