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Select the most appropriate option to substitute the underlined segment in the given
sentence. If there is no need to substitute it, select ‘No substitution required’.
We had not explored even a tiny fraction of space even after years of space research.
are not
No substitution required
could not
have not
- The sentence is in the present perfect tense, as it refers to an ongoing situation.
- "Had not" is incorrect here, as it indicates past perfect tense, which implies a completed action before another past event.
- "Are not" doesn't fit because it is in the present progressive tense and lacks the connotation of completion or achievement.
- Option 4: "have not": This is the correct choice as it employs the present perfect tense, suitable for describing a continuous state from the past into the present.
- No substitution required isn't suitable since the original sentence is in past perfect tense.
By: santosh ProfileResourcesReport error
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