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Relative Pronoun
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I don't know ______ he solved the problem.
A
what
B
where
C
why
D
how
Answer:
D. how
Related Questions:
He is not a person ….. I would trust.
One is responsible for _____ actions.
She is one ..... we can trust.
Nobody but ..... was present.
Sajin or Adarsh must do ..... work.
