【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】When you feel _________, you should go to see a doctor.

【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】When you feel _________, you should go to see a doctor.
选择一项：
A. sick
B. safe
C. Sad