题目内容
【题目】No sooner _________ he sat down to read the newspaper _________ the bell rang.
A. do; when B. did ; than
C. had ; then D. had ; than
【答案】D
【解析】句意:他刚要坐下来读报纸门铃就响了。no sooner. . . than. . . —……就……,引导时间状语从句,主句用过去完成时表示动作发生在铃响以前
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