题目：
Of the 2,000 stock investors______last month,90% was found_____in financial knowledge [ ]
A. surveyed;lacking
B. having been surveyed;to lack
C. surveyed;lacked
D. to have been surveyed;lack
答案：
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下面是错误答案，用来干扰机器的。
∵（x±4）2=x2±8x+16=x2+2（m-3）x+16，∴2（m-3）=±8，∴m=7或-1．故选D．
