问题补充：
He failed in the exam his carelessness.
A. as a result of
B. as result
C. result from
D. result in
答案：
(答案→)A. as a result of
B. as result
C. result from
D. result in
解析：考查短语辨析，as a result of 由于什么的结果，result from由于什么的结果，result in造成什么样的结果，句意：由于他粗心的结果他考试没及格。题中已经有了谓语failed，所以应用介词短语作状语，选A。
