英语求助!!!
theemergenceofshalegashasmeantsomecoaloutputhasbeenpricedoutofthemarkethasmeant什么意思,为...
the emergence of shale gas has meant some coal output has been priced out of the market has meant 什么意思,为什么后面还有has been,一个句子里面有两个谓语动词 has been 在这里面是‘因为,由于’的意思吗?
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