DeepikaV wrote:
In the option c, is it not correct to use ' had not been announced before/until 1968' ? because to emphasize that ' announcement' has not been made before 1968. 'no announcement' is before 1968 so i thought it should be past perfect tense. i understand first sighting in 1967 and then announcement in 1968 . so, use of past perfect for announcement is wrong. but, without the first clause is it right to use past perfect for the second clause?
Use of past perfect is redundant when using "before".
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