Though the police have been a unable to nail the guilty b their investigations have completely ruled...........

English ( Master) Verb

Though the police have been (a)/ unable to nail the guilty, (b)/ their investigations have completely ruled out the possibility of outsiders (c)/ have killed the man and his wife. (d)/ No error (e).

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Explanation:

Correct answer is (d). The correct verb to be used in the fourth part of the sentence is ‘having’ to make the sentence grammatically correct. This is a case of perfect participle. We form the participle by putting ‘having’ in front of past participle. Eg: Having killed. This is used to denote completed action.