Question

The boy ___________ go to bed _________ his mother came back.

A. won’t ; until
B. didn’t ; until
C. will ; until
D. won’t ; before

Answer 1

答案B
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。