问题补充:
The boy go to bed his mother came back.
A. won’t ; until
B. didn’t ; until
C. will ; until
D. won’t ; before
答案:
A. won’t ; until
(答案→)B. didn’t ; until
C. will ; until
D. won’t ; before
解析:考查not…until结构。据his mother came back应用一般过去式,选B.直到母亲回来,这个男孩才上床睡觉。
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