These chairs may look good, but they’re very un-comfortable _____.
A．to sit onB．to be sat onC．sit onD．sitting on
A

試題分析：這里they是句子的主語(yǔ)，并且作介詞on的賓語(yǔ)。這時(shí)用不定式的主動(dòng)形式表示被動(dòng)含義。故選A。句意：這些椅子看起來(lái)好，但它們坐上去不舒服。
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