Undergo vs suffer.

[hoangkha]

Hello, teachers!
Her mother was seriously ill. She was about to ________ a major operation.
A. spend
B. undergo
C. suffer
D. receive
The key is B, but why isn't C chosen, please?

 

[5jj]

Because we don't usually 'suffer' operations.

 

[emsr2d2]

You undergo an operation. As a result, you might suffer some pain or discomfort afterwards. You were probably suffering from something which caused a medical problem in order to require an operation.