the girl was too selfish and never thought of others she wasn’t getting on well with her

问题补充：

the girl was too selfish and never thought of others, she wasn’t getting on well with her classmates.

A. Though

B. Unless

C. Since

D. Until

答案：

A. Though

B. Unless

(答案→)C. Since

D. Until

解析：考查连词：A. Though虽然，B. Unless除非，C. Since自从，既然，D. Until直到，句意：既然这个女孩太自私了，从不想到别人，她和同学相处不好。选C。