due to, owing to, because of
这些词组均表示“由于”之意。
due to : 用于较庄重的书面语中，侧重“起因于”，在句中多作表语，有时作状语。
Her absence is due to illness.（她因病缺席。）
owing to : 可以和due to换用，但在句中多作状语，也可作表语。
Owing to the rain, the match was canceled.（因为下雨, 比赛取消了。）
because of : 着重某种原因的理由，在句中通常作状语。
It was because of the job that he had taken the flat.（他因为工作的原因租了那套公寓。）