He asked me whether my brother ________ (fly) to Beijing.
had flown
暂无解析
Hotmetal________asitgrowscooler.
________(fail)severaltimes,theyneedsomeencouragement.
Iknowitisn’timportantbutIcan’thelp________aboutit.
Howlong________they________(dig)theditch?
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
