选择题～～
the surgeon examined the patient quickly ,and then_____.a.the operation was begun.b.began the operation为什么选b？a怎么不对啦？另外，the operation began对不？
参考答案:我也想不通，用连词连接的两个分句应该可以用不同的主语的啊。
我在网上找的例句
He opened the door, and a smoky brightness fell out.
请各位指教！