His laziness his failing in the exam.A. result fromB. accounts forC. because ofD. is on a

问题补充：

His laziness his failing in the exam.

A. result from

B. accounts for

C. because of

D. is on account of

答案：

A. result from

(答案→)B. accounts for

C. because of

D. is on account of

解析：考查词组：A. result from源于B. accounts for是…的原因C.because of 因为D. is on account of由于，句意：他的懒惰是他考试不及格的原因。选B。