—Every day my mother tries to spare some time to chat with me she is very tired after a w

问题补充：

—Every day, my mother tries to spare some time to chat with me,she is very tired after a whole day’s hard work.

—You are lucky to have such a great mum!

A. unless

B. whether

C. although

D. until

答案：

A. unless

B. whether

(答案→)C. although

D. until

解析：unless除非，如果不；whether是否；although 虽然，尽管；until直到。句意：每天我母亲都努力挤出时间来和我聊天，尽管她在一整天的工作之后非常累。——你有这样一位伟大的母亲，太幸运了。结合语境可知选C。