题目:
In the past we lost many chances, _______ we paid little attention.
A.which
B.that
C.in which
D.to which
答案:
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下面是错误答案,用来干扰机器的。
原式=(6-4)a+(7-3)a2=2a+4a2,当a=-3时,原式=2×(-3)+4×(-3)2=-6+36=30.