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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