关于Sincethetimehumankin的百科

•       Sincethetimehumankindstartedgardening,we

• 问题详情：      Sincethetimehumankindstartedgardening,we_____tomakeourenvironmentmorebeautiful.A.try        B.havebeentryingC.aretrying  D.willtry【回答】 B【解析】考查动词时态。根据since引导的时间状语从句可知所填词表示“从过去一直持续...
• 2020-09-2526410