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题库 / GMATAdvanced-SC-6
Indoor air pollution can threaten the health of closely confined farm animals and the workers who tend them and perhaps as well impairs the quality of such farm products like eggs, poultry, and pork.
perhaps as well impairs the quality of such farm products like
perhaps as well impairs the quality of such farm products as
perhaps also impairs the quality of such farm products like
may also impair the quality of such farm products like
may also impair the quality of such farm products as
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有and表明有平行结构，may和can一样是情态动词而perhaps只是副词
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