问题
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
B:before he came
C:until he has come
D:when he comes
正确答案是：
同类题型
Must he finish the work before supper—-No, he .He finish it aftersupper.
The manager urged older staff ________early retirement and new staff _______ more time for work.
Why does the lake smell terrible — Because a large amount of water_______.
Can you imagine the trouble that they had ___ the orphan in the terrible years?