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

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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“演讲的起源仍然是个谜团______我们对于写作的起始有了相当 准确的观点”。根据句意,前后表示转折关系,though意为“虽然,但是”,故选C。
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