C
AD句意不通 ,B时态不符（应该是since+完成时）
这句话翻译过来大概就是他一出老师的办公室就马上回来又重敲了
___ he was out of the room,he turned back and knocked at the teacher's door again.
___ he was out of the room,he turned back and knocked at the teacher's door again.
A Before
B Since
C As soon as
D Unitil
说明原因
A Before
B Since
C As soon as
D Unitil
说明原因
英语人气：942 ℃时间：2020-06-03 02:08:07
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