The reason why he failed is he was too careless.A. becauseB. thatC. forD. because of

问题补充：

The reason why he failed is he was too careless.

A. because

B. that

C. for

D. because of

答案：

A. because

(答案→)B. that

C. for

D. because of

解析：可联系答案网客服索取。