A、公有制经济
B、股份制经济
C、国有经济
D、集体经济
Moviegoersknowthatmanyspecialeffectsarecreatedbycomputers,theyoftendon'tknowisthatthesescenesstillrequirealotofwork.
A、That
B、Whom
C、What
D、How
A、科技研究
B、历史研究
C、人类遗传研究
D、人类生理研究
Notuntilthegamehadbegun__atthesportsground.
A、shouldhehavearrived
B、wouldhehavearrived
C、didhearrive
D、hadhearrived