Elitmus Exam Verbal Ability Sentence Completion

i know all about that film because i_________it twice.
A)saw B)have Seen C)had Seen D)none.
can u pls explain how???

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Elitmus Other Question

A cask full of milk,'E' liters is removed and water is mixed. This process is repeated and now the ratio in milk to water is 16:9. Then what is the amount of milk in liter.
E+9 9E 5E cant be determined
what is the probability of always having x+y>0 ,where y<0
a)1/2
b)1/8
c)3/4
d)1/4