19．Some passers-by witnessed the car accident  _______  five passengers were killed，a baby included．（　�。�
A．thatB．whichC．in whichD．in that

分析 一些路人目睹了這起車禍，在車禍中，有五名乘客喪生，其中包括一個嬰兒．

解答 答案：C．
本句中先行詞the car accident，定語從句中缺少狀語成分，結(jié)合先行詞可知用in which來引導，相當于where．D項結(jié)構(gòu)錯誤，介詞加關系代詞指物時用which，指人時用whom；that和which在從句中只能用作主語或定語，不能作狀語；故選C．

點評 在定語從句中，關系副詞=介詞+關系代詞which；同時要分析定語從句的句子結(jié)構(gòu)，如果句子很完整就使用關系副詞，如果句子中缺少主語，賓語，表語或者定語就使用關系代詞．

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