I knew I couldn't finish my homework ( ).A.by he had come B.until he came C.when he comes D.before he comes

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IknewIcouldn''tfinishmyhomework().A.byhehadcomeB.untilhecameC.whenhecomesD.beforehecomesIknewIcouldn''

I knew I couldn't finish my homework ( ).A.by he had come B.until he came C.when he comes D.before he comes
I knew I couldn't finish my homework ( ).
A.by he had come B.until he came C.when he comes D.before he comes

I knew I couldn't finish my homework ( ).A.by he had come B.until he came C.when he comes D.before he comes
B
这个句子的意思是 我当时知道我不可能在他到来之前写完作业.(已经发生过了)
这是过去时态 排除CD A的表达不对 没有那样说的

B not until 是直到···才···的意思