---Why were you late for school today?
----It was ________ I help catch a thief on the bus.
A．sinceB．a(chǎn)sC．forD．because
D

試題分析：連詞辨析。Since表示眾所周知的原因；as由于；for表示補充說明，一般放在句末；because用來回答why的問句。句意：—為什么你今天上學(xué)遲到？—就是因為我?guī)椭谲嚿献チ艘粋�賊。故D正確。
點評：對于表示原因的四個連詞的本題側(cè)重點：Since表示眾所周知的原因；as由于；for表示補充說明，一般放在句末；because用來回答why的問句。
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