Question

【题目】—When did he，to bed yesterday?

— .

A. By the time his mother came back B. Not until his mother came back

C. Until his mother came back D. Since his mother came back

Answer 1

【答案】B

【解析】句意：——昨天他几点去睡觉的？——直到他的母亲回来。这里句子的完整回应答是He didn’t go to bed until his mother came back。Not...until...表示直到……才；根据题意，故选B。