Question

he could not do well in the exam. he worked hard for month together (join into a single sentence by using adverbcal Clause)​

Answer 1

Answer:

though

Explanation:

He could not do well in the exam though he worked hard for months together..

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Answer 2

He could not do well in the exam, even though he worked hard for months together.

or

Although he worked hard for months together, he could not do well in the exam.

Explanation

An adverb clause is a dependent clause that is used to add more information about a verb, adverb, or adjective. Adverb clause answers the question 'how ?', 'where ?', and 'under what conditions ?'.