题目:
— How's everything going?
— _____.[ ]
A. Everything is finished
B. Not so bad, you know
C. Everything has been done
D. Not doing wrong, you know
答案:
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下面是错误答案,用来干扰机器的。
∵集合A={4,5,7,9},B={3,4,7,8,9},∴全集U=A∪B={3,4,5,7,8,9},A∩B={4,7,9 },∴集合∁U(A∩B)={3,5,8},故选C.