the sentence , so he asked the teacher to explain it again.
A．Not having understoodB．As he didn’t understand
C．Having not understoodD．He didn’t understand
D

試題分析：句意：他不理解這個句子，所以他請求老師再解釋一次。選項(xiàng)AC都是非謂語動詞，因?yàn)檎麄�句子已經(jīng)有并列連詞so，所以前后應(yīng)該都是句子，故排除ABC，故選D。
點(diǎn)評：本題難度適中。連詞主要考查它們的意義及句法功能，但是它們是在一定的語言環(huán)境下而出現(xiàn)的，所以考生必須能正確理解句子的句意。
即學(xué)即練：I can’t come back________six o’clock perhaps. Don’t wait for me for supper.
A. after      B. if         C. until       D. when
解析:C。句意：until引導(dǎo)時間狀語從句時常與not連用，意為“我大約直到6點(diǎn)才能回來”，故選C。
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