He is going into hospital to have a small her knee. A．operate on B．operation for
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He is going into hospital to have a small__________ her knee.
| A．operate on | B．operation for | C．operation to | D．operation on |
试题答案
【答案】
D
【解析】固定短语。Have an operation on sb给某人动手术。Operate是动词，operation是名词。