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求详细解释!Mysister'sprofessorhadherpapermanytimesbeforeallowinghertopresentittothecommittee.A.rewrittenB.torewriteC.rewriteD.rewriting

题目详情
求详细解释!My sister's professor had her paper__ many times before allowing her to present it to the committee. A. rewritten B .to rewrite C. rewrite D. rewriting
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答案和解析
a have sth done.让什么被做.have .to do 是让...去做.c d明显没对,没这种搭配.
其实就是考察主被动的知识,her paper明显是被修改.