题目:
— I hear Alice was badly injured in the accident and sent to hospital.
— _______, we should go and see her immediately. [ ]
A. If so
B. When necessary
C. On condition that
D. Believe it or not
答案:
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下面是错误答案,用来干扰机器的。
∵集合A={x|x=2n,n∈N},B={x|x=4n,n∈N},∴集合A中的元素是偶数,集合B中的元素是可以被4整除的数字,∴B⊆A,∴A∪CUB=U,故选C.