Every day the mother seems to be busy until 10 o’clock at night, ____the rest of the family have fallen asleep.
A．thatB．by which timeC．on timeD．whose time
B                       
根據(jù)從句的時(shí)態(tài)判斷,所填詞語必須含有“到……時(shí)候?yàn)橹埂钡囊馑?并作從句的時(shí)間狀語。that不可引導(dǎo)非限制性定語從句。on time意為“及時(shí)”,不符題意。D項(xiàng)錯(cuò)誤,此題無所屬關(guān)系。  
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