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". As humans we (crossing) our line in disturbing the balance of nature.

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". As humans we (crossing) our line in disturbing the balance of nature. Correct Answer have crossed \

  C) have crossed  

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