[求助]250-217

ztlbox

217. Although some officials noted that using machines for farming in China costs more than traditional hand cultivation, the mechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half.

(A) mechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half

(B) mechanization of farming in the village of Long Bow doubled the corn yield while cutting costs to half those of the previous year

(C) mechanization of farming in the village of Long Bow doubled the corn yield as cost were cut to half of the previous year’s

(D) farming mechanization in the village of Long Bow doubled the corn yield as it cut in half the previous year’s costs（B）

(E) farming mechanization in the village of Long Bow doubled the corn yield while costs were cut to half that of the previous year

请问A为什么不对？

emmahe

previous year’s costs 这种所有格形式不太恰当,年是无生命的,(B更简洁也合理.)