题干
My parents asked me ______ my sister with her schoolwork.
A：help
B：to help
C：helping
D：helped
答案(点此获取答案解析）
B
My parents asked me ______ my sister with her schoolwork.
A：help
B：to help
C：helping
D：helped
文上呈汉武帝，所有竹简需要两人抬进宫。以后改变携书不便现象首先得益于发明了( )