请选择ABCD'~5H/A Mary wants to go to the toilet. She should say,5S3y(\1f-L,y
A. I want to go to the toilet.5S3y(\1f-L,y
B. May I go to the toilet?5S3y(\1f-L,y
C. Go to the toilet.5S3y(\1f-L,y
D. Must I go to the toilet, please?5S3y(\1f-L,y