The origins of human speech remain a mystery,__________ we have a fairly accu...

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问题 The origins of human speech remain a mystery,__________ we have a fairly accurate idea of when writing began.

选项 A. once
B. if
C. though
D. since

答案C

解析考查连词辨析。句意为“我们对于写作的起始有了相当准确的观点，演讲的。起源仍然是个谜团”。根据句意.前后表转折.故选C。

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