Which of the following is a complex sentence?
A. The dentist did not find anything wrong with her teeth, but Sue continues to have a toothache.
B. Although the dentist found nothing wrong with Sue's teeth, she still had a toothache, so she went to bed.
C. The dentist did not find anything wrong with Sue's teeth.
D. Although the dentist did not find anything wrong, Sue's mouth still hurt.
1 answer
B. Although the dentist found nothing wrong with Sue's teeth, she still had a toothache, so she went to bed.