She spent a few minutes reading the menu before she started to order her food.(同义句改写)It her a few minutes to read the menu before she started to order her food.
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Mark had finished his homework. His mother then let him go out to play.(用once改写句子), his mother let him go out to play.
He failed in the final exam. His father then stopped sending him money. (用once改写句子), his father stopped sending him money.
The tennis star showed up. All the students then pushed forward to greet her.(用once改写句子)
动车组通过受电弓接收接触网( )的高压电,再经过用电设备变换后,供动车组设备使用。
A. 25KV
B. 35KV
C. 45KV