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

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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