问题补充:
I go to bed my mother came back home.
A. won’t, until
B. didn’t, until
C. will, until
D. /, when
答案:
A. won’t, until
(答案→)B. didn’t, until
C. will, until
D. /, when
解析:句意:直到妈妈回来我才上床睡觉。从句用了一般过去时态,表示事情发生在过去,故主句用一般过去时,not until直到……才……。故选B。
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