The following questions present a sentence

问题：

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Some soldiers that were killed and seriously injured in the fighting last year were not trained according to regulations.（）

A. Some soldiers that were killed and seriously injured in the fighting last year were not

B. In the fighting last year some of the soldiers that were killed or seriously injured were not

C. Last year some of the soldiers that were killed and seriously injured in last year’s fighting had not been

D. Some soldiers that were killed or seriously injured in the fighting last year had not been

E. Some soldiers that were killed or seriously injured in last year’s fighting have not been