I _ Helen for a number of years.
Correct answer: D. Have known
- A. Will be knowing
- B. Had been knowing
- C. Know
- D. Have known
Explanation
The sentence talks about knowing Helen from the past up to now. For this, we use the present perfect tense: have/has + past participle. "Have known" shows that the knowledge started in the past and continues to the present.
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Tenses show when an action or state occurs and whether it is complete, continuing or repeated. The work covers present, past and future forms, including simple, continuous, perfect and perfect continuous constructions, as well as sequence of tenses and the difference between tense and aspect.
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