5.They ___ (help)us since five this morning until now.应该填什么,怎么分析的?

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5.They___(help)ussincefivethismorninguntilnow.应该填什么,怎么分析的?5.They___(help)ussincefivethismorninguntil

5.They ___ (help)us since five this morning until now.应该填什么,怎么分析的?
5.They ___ (help)us since five this morning until now.应该填什么,怎么分析的?

5.They ___ (help)us since five this morning until now.应该填什么,怎么分析的?
have been helping是现在完成进行时的用法.表示从过去开始一直进行着直至现在.