Having taken our seats， _____. A . the professor began the lecture B . the lecture began in no time C . we were attracted by the lecturer immediately D . the bell announced the beginning of the lecture

Having taken our seats， _____.
A . the professor began the lecture
B . the lecture began in no time
C . we were attracted by the lecturer immediately
D . the bell announced the beginning of the lecture

出自：山东第一医科大学英语（4）

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