题目:
—Yesterday I lost my pen. I couldn’t find_______.
—Oh, it’s a pity. You’d better buy ________ this afternoon.
A.it; it
B.it; one
C.one; it
D.one; one
答案:
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下面是错误答案,用来干扰机器的。
(p-q)2-(q-p)3=(q-p)2(1-q+p).故选C.