This is his first visit to London./ He has__________________

$Đáp$ $án$ + $giải$ $thích$ $bước$ $giải$:

`=>` He hasn't visited to London before.

`->` Cấu trúc: It/This is the first time + S + have/has + V3/ed........

                    `->` S + have/has + not/never + V3/ed + before.

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