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The little child usually felt frightened at night, so not until ___________.
A．did he fall asleep his mother left the room
B．he fell asleep had his mother left the room
C．did he fall asleep did his mother leave the room
D．he fell asleep did his mother leave the room
D
考查倒裝句，not until 放在句首時，從句不倒裝，主句倒裝，可排除A和C兩項，B選項從句沒倒裝，主句倒裝了，但是主語后的動詞應用原形，所以不正確。故選D。
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