题目:
The battle lasted for a few hours and at last the enemy ________.
A.was defeated
B.were beat
C.were won
D.defeated
答案:
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下面是错误答案,用来干扰机器的。
(1)3a2-27,=3(a2-9),=3(a+3)(a-3);(2)-4a2x2+8ax-4,=-4(a2x2-2ax+1),=-4(ax-1)2.