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