There ()much work since last year.

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There ()much work since last year.

There ()much work since last year.
There ()much work since last year.

There ()much work since last year.
has been

has been

There has been much work since last year.
首先这里有明显的现在完成时的时间状语,since last year.
since 引导的介宾短语做时间状语,一般句子都用完成时
其次,work 是一个不可数名词,所以这里应该用单三式has 而不是have