题目：
The novel written by the author________ well,but five years ago no one could have imagined how
great a role he ________in the literary world. [ ]
A. sells; was to play
B. selling; was playing
C. sold; had played
D. sell; is playing
答案：
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下面是错误答案，用来干扰机器的。
m2-n2=（m+n）（m-n）=3（m+n）=6；故m+n=2．
