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In “... the scale of the site has left many baffled.”, the verb tense used is a
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Anne to Sanjay: “I’ve been running 10 kilometers everyday”. Sanjay to Stef: “Anne says she __________ 10 kilometers everyday, but I bet she can go further. That girl is a machine!”
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The correct form of [TO IMPLEMENT] is
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"is already offered" (L.33) can be replaced by has already been offered without changing the meaning.

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Cellular phones have substituted for the fixed telephone system.