AlthoughSPanish，heattendedthecourse.
A、hewasknowingheisknowinghavingaknowledgeofknows
B、hewasknowingheisknowinghavingaknowledgeofknows
C、hewasknowingheisknowinghavingaknowledgeofknows
D、hewasknowingheisknowinghavingaknowledgeofknows
Oneoftherequirementsforafireisthatthematerial____toitsburningtemperature.
A、beheated
B、isheated
C、wouldbeheated
D、toheated
Everymeans____triedoutbutneverwithsuccess,asfarasmyknowledgegoes.
A、is
B、are
C、hasbeen
D、havebeen
Whiledoingcalculationfortheproject,thedesigners____anewsolutiontoageologicalproblem.
A、fellinto
B、stumbledupon
C、setout
D、discovered
Henoticedthehelicopterhoveringoverthefield.Thentohisastonishment,hesawaropeladder_____outandthreemenclimbingdownit.
A、throwing
B、beingthrown
C、havingthrown
D、havingbeenthrown