she'll .almost$1,000 by them.A.save B.have saved.C.have been saving.B.be saving请帮我选正确答案并找出原因

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she'll .almost$1,000 by them.A.save B.have saved.C.have been saving.B.be saving请帮我选正确答案并找出原因
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she'll .almost$1,000 by them.A.save B.have saved.C.have been saving.B.be saving请帮我选正确答案并找出原因
she'll .almost$1,000 by them.A.save B.have saved.C.have been saving.B.be saving
请帮我选正确答案并找出原因

she'll .almost$1,000 by them.A.save B.have saved.C.have been saving.B.be saving请帮我选正确答案并找出原因

C 将来完成时 have been doing
意思是他们将会帮她节省将近1000美元

..............by them or by then ?