句子的意思是“在中国,塑料袋过去和现在仍然被广泛使用”.
你就能明白了为什么用“were”.
plastic bags ,which were and are still being widely used in china .which后面为什么要用were 、
plastic bags ,which were and are still being widely used in china .which后面为什么要用were 、
英语人气：199 ℃时间：2019-10-23 05:22:29
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