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题库 / Prep2007E1-SC-82
Each year companies in the United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.
annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided
annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing
annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing
in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided
by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided
1) each year和annually重复，排除A,B,C.
2)...companies could save money by doing sth v.s. in sth. 语义有别。在此需要表达的是通过预防疾病来省钱，用by. 而in的意思是在预防疾病上省钱，不准确。
3）此外，they指代是的companies,没毛病。
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