145. 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.
A. that, in order to maintain competitiveness, rich nations have joined this downward slide toward more lax attitudes about pollution
B. that, for maintaining competitiveness, rich nations join in this downward slide toward more lax attitudes about pollution
C. that rich nations join this downward slide toward more lax attitudes about pollution because of wanting to maintain competitiveness
D. that in rich nations, joining this downward slide toward more lax attitudes about pollution is a result of wanting to maintain competition
E. that wanting to maintain competition is making rich nations join in this downward slide toward an attitude about pollution that is more lax
A中，in order to 前面的逗号怎么解释？
B中，for maintaining 前面的逗号怎么解释？
时态问题可以理解，用have done表示“已经”，没有问题；
表示目的时，用in order to 和用for，怎么判断？还可以用want to do吗？
C中，because of 后面接doing不对；
D和E中，competition做竞争讲，二competitiveness，做竞争力讲，不能替换！
同志们，有何高见！ | 
