The origins of human speech remain a mystery,_________

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

作者: tihaiku 人气: - 评论: 0

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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