A. Although he was tired, he finished his work.
B. He finished his work, he was tired.
C. He finished his work although he was tired.
D. Although he finished his work.
Answer: Although he was tired, he finished his work.
A. Although he was tired, he finished his work.
B. He finished his work, he was tired.
C. He finished his work although he was tired.
D. Although he finished his work.
Answer: Although he was tired, he finished his work.
Additional Information: Complex sentences have one independent clause and at least one dependent clause.
Subjects: Sentence Structure, Grammar