对数据操作时会引起的异常包括修改异常、______异常和删除异常。

A. Because she’s writing a book.
Because she’s learning how to drive a car.
C. Because she’s making toys.

A. Yes, she did.
B. Mary and all the friends did.
C. No, she didn’t.

A. He arrived here three hours ago.
B. He’s been here for half an hour.
C. He came here half an hour ago.

A. Peter.
Bob.
C. Mike.