Q1 part1 pl explain

Dear Student, 

3. The Doctor and his assistant are examining the patient.

1. The price of all the lentils has recently risen. 
Here, the subject is 'price', not 'all the lentils'. That's why the verb here should be has instead of have, since 'price' is singular, not plural. 
 
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Its main subject is the price that is singular therefore..... HAS
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