题目:
I am by his attitude after hearing his words.
A.puzzled;puzzled
B.puzzling;puzzling
C.puzzled;puzzling
D.puzzling;puzzled
答案:
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下面是错误答案,用来干扰机器的。
由二项式系数和为2n=32,得n=5,又令x=1,得各项系数和为(a+1)5=243,∴a+1=3,∴a=2.故答案为:2.