如 At 7 o"clock YESTERDAY evening i heard him _____ (唱歌） in the next room 此题答案为什么是
singing 如果是过去进行时的话那不应该是 was singing
人气：221 ℃ 时间：2019-10-26 11:45:38
解答
hear sb doing 固定用法,听到某人正在做某事,就不用加was了~
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