[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.I first met Lily five years ago. She （ ） as a nurse in a hospital at the time.
A
was working
B
has worked
C
had been working
D
had work
正确答案：A
题目解析
结合句意讲述五年前的事，又结合at that time（在那个时候，当时）可以确定表示“过去正在进行”的过去进行时最符合句意，故选A。
