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【題目】Jack is still working to high standards he has made great achievements．

A．until B．if C．though D．Because

【答案】C

【解析】

試題分析：句意：杰克仍然是的高標準的來工作，雖然他取得了巨大的成就。A．until直到……為止； B．if如果；C．though盡管；D．Because因為。結合句意可知，此處應選擇表示讓步關系的從屬連詞。故答案為C。

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