21. He apologized ________ late.

A．to his teacher to arrive

B．to his teacher for arriving

C．at his teacher to arrive

D．at his teacher for arriving

以下哪些对“想像”概念阐述是正确的（）

A、想像就是不着边际的幻想

B、想像高于一般的联想

C、想像来源于现有的事物又高于现有事物

D、想像可以帮助人们跨越时空限制，自由思考