請依下文回答第 36 題至第 38 題:David knew that doctors were good men, and the adults had always told him that doctors were there to help people
when they were ill. So he 36 quietly while the doctor touched him and 37 the dirt away with something from
a bottle. It hurt all the time, and then the doctor put something else on his burns, and that hurt, too. But the doctor
explained that 38 he did not do it, the burns would be more painful the next day.
【題組】38
(A)if
(B)though
(C)since
(D)as