My parents were quarrelling about me ____ I could not quite tell why．
A．sinceB．thoughC．ifD．until
B 
though引導(dǎo)讓步狀語從句，意為“雖然”，表示雖然不知道父母為什么為自己而爭吵。since引導(dǎo)原因狀語從句或時(shí)間狀語從句，意為“因?yàn)椤被颉白詮摹�。if引導(dǎo)條件狀語從句，意為“如果”。until引導(dǎo)時(shí)間狀語從句，意為“一直”。
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