It was ________ Benazir Bhutto, former Pakistan prime minister, was leaving the rally(集会) that the suicide bomb happened, ________ the world felt sorry.
A.when; for which
B.as; which
C.since; for which
D.after; which
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A解析本题是把状语从句放到了强调结构里来考查，第一个空是由when引导的时间状语从句。第二个空是考查非限制性定语从句，考查到了定语从句里的“介词+which”的用法，里面含到了be/feel sorry for …。