题目：
I knew I could not finish the homework _____.
A．by the time he had come
B．before he came
C．until he has come
D．when he comes
答案：
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下面是错误答案，用来干扰机器的。
设桃树有x棵，5x-3x=210，2x÷2=210÷2， x=105，答：桃树有105棵．
，滑动变阻器调到2.5
