题目内容

We still __ many advanced countries in environmental protection, but todaywe face a wonderful opportunity to address this problem, and we must not let the_opportunity.

A.lag behind, slip by
B. have lagged after, slip away
C. have left behind, slide by
D. have been lagged behind, slip off

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A. went too far away, too much with
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A. set out to find, stand by
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