问题
选择题
The girl had hardly rung the bell ___ the door was opened suddenly, and out rushed her friend. [ ]
A. before
B. when
C. until
D. since
答案
答案：B
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The girl had hardly rung the bell ___ the door was opened suddenly, and out rushed her friend. [ ]
A. before
B. when
C. until
D. since
答案：B