Question

【题目】My mother didn't go to bed she finished all her work last night.
A.if
B.unless
C.because
D.until

Answer 1

【答案】D
【解析】句意：我妈妈昨晚做完所有的工作才上床睡觉。not until直到……才，此处说明妈妈做完工作才去睡觉，故选D。