-Come on, please give me some ideas about the design.
A. filling
B. filled
C. to fill
D. being filled
网友回答
(答案→)A. filling
B. filled
C. to fill
D. being filled
解析：考察动名词用法。本句中的动名词filling放过在介词about的后面，做介词的宾语，形成动宾短语。介词的后面一般要接名词或者动名词做宾语。根据句意说明使用主动语态。故A正确。