Question

Add a clause to expand the sentence meaningfully..( A) Nobody thought ......... ..​

Answer 1

hey mate here is your answer

Nobody thought- he could solve this sum.

hope it helps
mark as brainliest...............

Answer 2

Nobody thought that he could clear UPSC.

The above clause added is a relative clause. A relative clause cannot stand alone and has to be paired up with an independent clause to form a sentence with a meaning.

A clause can be defined as a group of related words. There are diverse types of the clause that are used in a sentence in order to develop a sentence.  

Apart from the relative clauses, there are clauses like independent clause, dependent clause , noun clause etc.