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求问prep2012的一道sc:
25. VSC002602
After long years of indifferent reception by the scientific community, Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be of major importance; her analyses show that movable elements control the action of genes and thus cause mutations.
A. Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be of major importance
B. Barbara McClintock's subtle work on the genetics of corn has now been acknowledged as being major
C. it has now been acknowledged that Barbara McClintock's subtle work on the genetics of corn is major in importance
D. there is now acknowledgment of Barbara McClintock's subtle work on the genetics of corn as of major importance
E. the importance of Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be major
答案是A,我想知道为什么不能选C呢?里面的it可以看成是placeholder吗? |
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