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- I ______________ (to know) Alex since 1999.
Question 1:
I ______________ (to know) Alex since 1999. A. am knowing
B. know
C. have known
Feedback The action in this sentence started in the Past (1999) and continues in the Present. It means that I still know Alex. In this case we should use the Present Perfect Tense: has/have + Verb (-ed/Past Participle)
D. have knew
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