OG204 In recent years cattles breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.
(A) in part that their steers should acquire certain characteristics |
(B) in part for the acquisition of certain characteristics in their steers |
(C) partly because of their steers acquiring certain characteristics |
(D) partly because certain characteristics should be acquired by their steers |
(E)partly to acquire certain characteristics in their steers |
答案是E. 但和后面的 partly because crossbreeding is said to provide hybrid vigor.不构成平行结构。D是不是更好呢?虽然用了被动语态。
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