Answer:
WX
Step-by-step explanation:
CD HI MN RS we have to find next letters.
To find next letters first we write alphabets to find the relation in this sequence.
A B C D E J G H I J K L M N O P Q R S T U V W X Y Z
As we can see after 3 letters two letters have been taken.
so to continue the sequence next letters would be WX,