He changed so much that only when I looked closely________he was exactly my long lost friend.
A．I realizedB．did I realize
C．I did realizeD．realized I
B
B　考查倒裝句。Only 修飾狀語(yǔ)when I looked closely，后面的主句要部分倒裝，把助動(dòng)詞did提前，因此選B。
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