单项选择题 Wehave______upearlyinordertocatchtheearlybus.A.usedtogetB.beenusedtoget C.usedforgettingD.beenusedtogetting

多项选择题 实施安全检查就是通过访谈、查阅文件和记录、现场观察、一起测量的方式获取信息．其中现场观察是指观察（）．

单项选择题 Ithink______ofthematerialsIlistenedtoatthebeginningoftheexam______easy.A.threefourths,isB.thirdfour,are C.threefourths,areD.threefourth,are