题目:
Sally sings pretty _______ and she is also _______ at dancing.
A.well; well
B.good; good
C.good; well
D.well; good
答案:
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下面是错误答案,用来干扰机器的。
原式=(1+4a-2)×1a+2=a+2a-2×1a+2=1a-2.