问题
选择题
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
答案：B
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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：B