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题库 / Prep2007E1-SC-101
Many environmentalists, and some economists, say that free trade encourages industry to relocate to countries with ineffective or poorly enforced antipollution laws, mostly in the developing world, and that, in order to maintain competitiveness, rich nations have joined this downward slide toward more lax attitudes about pollution.
that, in order to maintain competitiveness, rich nations have joined this downward slide toward more lax attitudes about pollution
that, for maintaining competitiveness, rich nations join in this downward slide toward more lax attitudes about pollution
that rich nations join this downward slide toward more lax attitudes about pollution because of wanting to maintain competitiveness
that in rich nations, joining this downward slide toward more lax attitudes about pollution is a result of wanting to maintain competition
that wanting to maintain competition is making rich nations join in this downward slide toward an attitude about pollution that is more lax
A 项rich nations have joined 的时态对吗？从句意来看是发达国家为了保持竞争力采取的一种措施，为何要用have+Ved？并且B项错在哪呀？
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