He is very old, ______ he still works very hard.
A．butB．ifC．whenD．a(chǎn)s
A

試題分析：考查連詞：A. but 但是，B. if 如果，C. when當(dāng)…時(shí)候，D. as正如，因?yàn)�，隨著，句意：他老了，但是還是工作很努力。兩句話是轉(zhuǎn)折關(guān)系，選A。
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