you cannot see the doctor __you have made an appointment with hima except b even c however d unless答案是d 为什么不选a两者有何区别
问题描述：
you cannot see the doctor __you have made an appointment with hima except b even c however d unless答案是d 为什么不选a两者有何区别
答
except表示除了,是个介词,后面只能加上名词,而不能直接加上句子,否则要加上that