直到我看到蒂娜独自坐在黑暗处,我才意识到她不高兴 Not until I saw Tina sit alone in the dark did I realize that she was unhappy 再问： only when I saw Tina sit in the dark alone ____ I ____ she was unhappy 再答： only when I saw Tina sit in the dark alone did I realize she was unhappy
