Choose the missing terms out of the given alternatives. A, B, B, D, C, F, D; H, E, ?, ?

Starting with H, the first two terms are H and E. The third term is the same as the first, so the third term is E. The fourth term is the next letter in the alphabet, so the fourth term is F. The fifth term is the same as the third, so the fifth term is E.

Therefore, the missing terms are E and F.