关于Expertshavebeenwarni的百科

•  Expertshavebeenwarning   ofthehealthriskscausedbypassi...

• 问题详情： Expertshavebeenwarning   ofthehealthriskscausedbypassivesmoking  A.atatime    B.atonetime   C.forsometime  D.forthetime【回答】 C 解析：本题考查固定短语。从句中havebeenwarning可知，应用forsometime一段时间，atatime每次；atonetime曾经...
• 2019-05-1831260