36、（2018•上海）The teenagers had _____ good time in the summer camp in their sister school．
A．a B．an C．the D．/
36.A【解析】青少年们在他们的姐妹学校的夏令营里过得很愉快．联系语境，根据关键词had ____good time 可知此处为have a good time的固定表达，意为"过得愉快"，所以此处应用不定冠词a．故选A．