一道托福真题(语法),求救!!!!

summer_ice (夏日之冰)
The lenses in an optical microscope bend the light passing through a specimen to form an image of that specimen that is much larger _____ actually viewed.
(A) than it
(B)than the one
(C) one than
(D)than one which

答案是B,为什么呢? A为什么不对呢?
谢谢各位拉
(#142266@0)
2001-7-23 -05:00

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