未经( )合格的从业人员，不得上岗作业
B
暂无解析
阻止非法用户进入系统使用（）
—Whyhaveyouchangedsomuch?
—Youdon'tknowI______ahardlifeinthelasttenyears.
Therearemanyislands______thecoastofChina.
—What'stheweathergoingtobelikeattheweekend?
—______.
WhenBobwokeuphefoundhimselfinhospital,buthedidnt__________.