[求助]GWD9-15

GWD-9-Q15:

Dressed as a man and using the name Robert Shurtleff, Deborah Sampson, the first woman to draw a soldier’s pension, joined the Continental Army in 1782 at the age of 22, was injured three times, and was discharged in 1783 because she had become too ill to serve.

A. 22, was injured three times, and was discharged in 1783 because she had become

B. 22, was injured three times, while being discharged in 1783 because she had become

C. 22, and was injured three times, and discharged in 1783, being

D. 22, injured three times, and was discharged in 1783 because she was

E. 22, having been injured three times and discharged in 1783, being

A中的had become 不对把， become 是没有完成式的亚。

这个题目应该哪一个？？？D也不是很对， injure 应该被动。

还是不是很明白A中为什么要用was injured而不是injured,还有后面为什么用过去完成时而不是直接用过去时呢？谢谢