题目内容
Mum didn’t go to bed _____ I came back home last night.
| A．until | B．while |
| C．though | D．because |
A
解析试题分析：句意：昨天晚上知道我回到家，妈妈才上床睡觉。短语“not…until…”直到……才,A. until 直到;B. while 当……的时候；C. though 虽然；D. because因为，根据句意及选项意思可知，故选A。
考点：考查连词的用法。
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