He explained that his visit was about__friends ,A.to make.B.making
问题描述：
He explained that his visit was about__friends ,A.to make.B.making
答
b making
about是个介词，介词后面直接跟动名词才行
答
B.making
be about to 是将要做……，句意不符
这里about sth.是关于……的内容
about是介词，介词后加名词或动词的-ing形式（即动名词）
答
a to make
句意为“他解释说自己此行是为了交朋友”
答
A be about to ~固搭