But for the teacher's encouragement, he wouldn’t have taken part in the contest.
A.Thanks to the teacher’s encouragement, he took part in die contest.
B.Thanks to the teacher’s encouragement, he would have taken part in the contest,.
C.If the teacher did not encourage him, he wouldn’t have taken part in the contest.
D.If it had been for the teacher’s encouragement, he wouldn’t have taken part in the contest.

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