题目:
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 worked
答案:
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下面是错误答案,用来干扰机器的。
A、日食和月食是由光的直线传播形成的;B、海市蜃楼是由于光的折射形成的;C、小孔成像由光的直线传播形成的;D、激光准直利用的是光的直线传播.故选B.