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___________ he did to study for the final exam must have been helpful; his grade improved from a B to an A.

A:Which
B:That
C:So what
D:Whatever

2 Answers

6 votes
D: Whatever he did to study for the final exam must have been helpful; his grade improved from a B to an A.
User Xvlaze
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7 votes
D: Whatever he did to study for the final exam must have been helpful.
User Bruno Leveque
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