4. Then the professor walked onto the platform and seated himself in a chair, for answering questions.
A. had prepared B. being prepared
C. preparing D. prepared
4. D考查非謂語動詞。句意：然后教授走上講臺，坐在椅子上，準備回答問題。此處be prepared for sth意為"準備好了做某事"，過去分詞短語作伴隨狀語。所以選D。
題目來源：2015全品語法快練高中英語新課標 > 訓練19 非謂語動詞和獨立主格
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