They are thinking about _______ the poor children.        A. help    B. to help C. helping     D. helps

问题描述:

They are thinking about _______ the poor children.        A. help    B. to help C. helping     D. helps

C about 为介词,后接动词应为ing形式。

C,about是介词,介词后面接动词ing形式

C
about是介词