After going into the concert hall the mother a friend and went over to greet him.A. sea

问题补充：

After going into the concert hall, the mother a friend and went over to greet him.

A. searched

B. knew

C. spotted

D. realized

答案：

A. searched

B. knew

(答案→)C. spotted

D. realized

解析：考查动词：A. searched搜寻B. knew知道C. spotted突然看见D. realized意识到，句意：在进入音乐会大厅后，妈妈突然看见一个朋友，去和他打招呼。选C。

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