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My parents were quarrelling about me ____ I could not quite tell why.
A.sinceB.thoughC.ifD.until
though引导让步状语从句,意为“虽然”,表示虽然不知道父母为什么为自己而争吵。since引导原因状语从句或时间状语从句,意为“因为”或“自从”。if引导条件状语从句,意为“如果”。until引导时间状语从句,意为“一直”。
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