Your finger ( covered/have covered ) the lens when you was taking the photo.
问题描述：
Your finger ( covered/have covered ) the lens when you was taking the photo.
答
covered过去进行时不应该和完成时搭配？谁告诉你的?When Tom was doing his work, Jerry have already finished his.这么说不对吗？当然对，完成时表现了一种在持续做某事时，某事已经完成，第二句话说，汤姆做作业时，杰瑞的作业已经写完，强调已经完成的概念。而第一句，当你拍照时，你的手指挡住了镜头，强调的时你得手挡住镜头这个结果，而不是你的手已经挡住镜头的过程懂了么?原来如此！我总是分不清过去时和完成时！谢谢！给个采纳谢谢英语问题以后直接追问我太感谢/vv！ww