Choose the missing terms out of the given alternatives : A, CD, GHI, ? , UVWXY

Each term consists of consecutive letters in order. The number of letters in the terms goes on increasing by one at each steps. Also, there is a gap of one letter between the last letter of the first term and the first letter of the second term; a gap of two letters between the last letter of the second term and the first letter of the third term; and so on. So, there should be a gap of three letters between the last letter of the third term and the first letter of the desired term.