In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". I should (has to be) with them tonight.

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". I should (has to be) with them tonight. Correct Answer Have been

The correct option with regard to the tense that the sentence is in, is 'have been'. Since the subject is singular, the word 'have' is to be used. 

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