I knew I could not finish my homework______.A、by he had comeB、until he has come

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问题 I knew I could not finish my homework______.

选项 A、by he had come
B、until he has come
C、when he comes
D、before he came

答案 D

解析本题考查状语从句。句意：我知道在他来之前我完不成作业。句子时态为过去时，排除选项B和选项C。结合句意，完成作业在前，“他来”在后，从句不能用过去完成时，故本题选D。

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