I was reading attentively in my own room ________ suddenly he knocked at the door.
A.
when
B.
while
C.
then
D.
as
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举一反三
【简答题】Forbidden City Forbidden City lies at the city center of Beijing and it once served as the palace for 24 emperors during the Ming and Qing Dynasties. It is also known as the Palace Museum, and Gu Gong...