An investigation was made into the accident ______ fifty people were killed.A．for thatB．w
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An investigation was made into the accident, ______ fifty people were killed.
A．for that
B．when
C．where
D．in which
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正确答案：D
解析：本题考查定语从句。该句意为“人们对这一事故作了调查，在事故中有50人丧生”。根据句意，D项in which最为合适。which在此引导非限制性定语从句，其先行词为accident，介词in放在which的前面，表示“在这起事故中”。因此选项D正确。