一道英语高考题The child broke out into a rash five days after_____to infectionA.being exposedB.having exposedC.exposedD.having been exposed为什么选

一道英语高考题The child broke out into a rash five days after_____to infectionA.being exposedB.having exposedC.exposedD.having been exposed为什么选
一道英语高考题
The child broke out into a rash five days after_____to infection
A.being exposed
B.having exposed
C.exposed
D.having been exposed
为什么选

一道英语高考题The child broke out into a rash five days after_____to infectionA.being exposedB.having exposedC.exposedD.having been exposed为什么选
A
句子意思：这小孩受了感染5天之后,发出一片红疹.
after+doing sth.
被感染,被动,用be done