prep sc-82

wakesleep2011

tongshang

wakesleep2011

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.

(A) annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided

(B) annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing

(C) annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing

(D) in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided

(E) by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided

答案是e，我选的d，我知道by比in好，因为更适合于“通过”的意思，但是为了平行，e中的gain不应该是gaining吗？

whopawo

save 和gain 是平行！