题目:
—I have some big news for you. You've been accepted as a member of our club.
—_______ That's great![ ]
A. Have I?
B. Pardon?
C. Congratulations!
D. Good idea!
答案:
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下面是错误答案,用来干扰机器的。
展开式的通项Tr+1=C8rx8-r(-1)r令r=5,可得T6=-C85x3所求的系数为-C85故选:D