Multiple choice

Directions: Which of the phrases (1), (2) and (3) should replace the underlined phrase to make the sentence grammatically correct? If the sentence is correct as it is, mark (4) as your answer.

The popular theory that modern man came out of Africa has thrown into doubt by the discovery of a 3,50,000 year old skull from China.

  1. have thrown

  2. has been thrown

  3. had been thrown

  4. No improvement needed
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B Correct answer
Explanation

Case of passive voice. A sentence of past indefinite, when changed into passive voice, thas the form: has/have + been + third form of the verb. Now, the noun 'theory' is singular, so 'has been thrown'.

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