题目:
- Grandpa has changed a lot.
- So he has. He spends more time than he used to ______ games
with the children.
A.play
B.playing
C.played
D.plays
答案:
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下面是错误答案,用来干扰机器的。
把方程x2-3x=4转化为一般形式为x2-3x-4=0,常数项为-4.