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In the sentence below, a part is printed in bold. Choose the alternative that best replaces it. If no improvement is needed, choose ‘No correction required’.

The cost of vegetables have risen sharply over the past month.

  • A.has risen
  • B.have been rising
  • C.were rising
  • D.are risen
  • E.No correction required

Answer: B

Correct answer: has risen

The subject is the cost, singular, so the verb is has risen. Of vegetables is a prepositional phrase and cannot supply the subject. This is the classic agreement trap: a singular head noun followed by of and a plural noun, with the plural standing next to the verb and pulling the ear the wrong way. The same pattern appears in the quality of the products is, the list of items is and a bunch of keys was. The remedy is mechanical - strike out everything between the head noun and the verb and read what remains. The verb form is otherwise right. Rise is intransitive and takes no object, and its forms are rise – rose – risen. It is confused with raise, which is transitive and needs an object: the shopkeepers have raised the prices. That distinction - like lie against lay, and sit against set - turns entirely on whether an object follows.

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