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题库 / Prep2007E1-SC-59
A new genetically engineered papaya was produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but university and United States Department of Agriculture researchers who allowed growers to use it free of charge.
produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but
produced not by profit-motivated seed companies, the case with most genetically modified crops previously approved for commercial use, but
produced not by profit-motivated seed companies, as was the case with most genetically modified crops previously approved for commercial use, but by
not produced by profit-motivated seed companies, which was the case with most genetically modified crops previously approved for commercial use, but was produced by
not produced by seed companies who have been motivated by profit, the case with most genetically modified crops previously approved for commercial use, but by
CD区分：
C：as is the case，是插入语，as表示前面整个句子，算比较结构，表示前面***是这种情况（case后面的情况）
例子：as is said above, as already mentioned above ,as is known to all , as it is , as is often the case , as is reported inthe newspaper
D: which仅仅是一个定语从句，只能指代一个词而不是句子，起不到比较的等级作用
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