There______nothingmorefordiscussion,themeetingendedearlierthanexpected.
A、tobe
B、tohavebeen
C、being
D、be
A、氧流量05-1L/min，氧浓度不超过40%
B、氧流量2-4L/min，氧浓度不超过50%
C、氧流量4-6L/min，氧浓度不超过60%
D、以上都不是
Whatarethekeyfeaturesofaresearchpaper?
Theyareeager_______abroad.
A、travel
B、travelled
C、totravel
D、travelling
Whilecrossingthemountainarea,allthemencarriedgunslestthey______bywildanimals.
A、shouldbeattacked
B、mustbeattacked
C、couldbeattacked
D、wouldbeattacked