The Greens muset be really grateful to you since you ______(

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The Greens muset be really grateful to you since you ______(help)them so much.标准答案是have helped,为什么不能是helped,理由是什么?since作什么翻译?
这里的since绝对不是翻译成“自从”，若是此翻译的话，前面应为：The Greens have benn really grateful to you

since 也有“因为”的意思,由题知“已经造成了某种结果”所以用的是完成时态have helped .

The Greens muset be really grateful to you since you ______( I’m really very grateful to you 中文意思 The people _____ eye problems are grateful ______ you _____ You need to be really really Youcai you too!You really terrible!Very grateful! i am grateful to be employed by you.请问to be的语法结构 the Greens ______(be) at home yesterday 21.If you _______ me,I shall be very grateful to you. You really want to be on Really want to be with you dear has you to be really good Be able to meet you,really lucky