The person whois( in charge) of the foctory has (been )ill since last week为什么用括号里面的答案

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The person whois( in charge) of the foctory has (been )ill since last week为什么用括号里面的答案

1 be in charge of -- - - - 管理- - -
2 has + 过去动词(been)-----构成现在完成时.