he knew he could not finish his homework ___ .

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he knew he could not finish his homework ___ .
a.before his parents came
b.until his parents have come
c.by his parents came
d.when his parents come
写出原因!

选b.他知道直到父母回来他才能完成作业.首先排除第三个,by 后面应该是名词或动名词,第四个也不对,语意不通.剩下的两个,由于主语是过去时knew,那么后面的时态应该是更加过去的时态,因为那是他knew的内容,于是选第二个.

he knew he could not finish his homework ___ . 英语填空I knew I could not finish the homework until he ______ . he could not finish the homework he has 承认 that he did not finish his homework “_____ he ______(finish) his homework?”“Not yet.” 3.“_________ he ___________ (finish) his homework?” “Not yet he must __(finish)his homework first. To finish his homework,he needs____two hours. He ____ (finish)his homework yet. he ——（not finish）his homework until his father came back __（not let）him go if he __ （not finish）his homework.原因? he could have finished his homework,but he c（） not to