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Relative Pronoun
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I don't know _____ he did this.
A
what
B
why
C
which
D
who
Answer:
B. why
Related Questions:
He is a good person ............. is loved by everybody.
She and ..... were good friends.
This is the girl ____ comes from Spain.
My sister ______ has gone to Australia.
I did ........ I could
