9．Mark needs to learn Chinese _______ his company is opening a branch in Beijing．（　　）
A．unlessB．untilC．althoughD．since

分析 麥克需要學習漢語了，因為他的公司在北京開了分公司．

解答 答案：D 
unless除非；until直到；although盡管；since因為．題干表示的是因果關系，故選D．

點評 從屬連詞連接狀語從句，類型較多，用法靈活．學習時要注意區(qū)分和掌握．

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