1.leading to many mistakes lead his failure.主动含义,因此选择V-ing
此外,B本身是个错误,which 指代many mistakes 应跟lead
2.happy memories 不能自己涌上心头,所以选crowded,表被动含义
3.have something doing让宾语一直做着 ：something 与 doing之间也是逻辑主谓关系,表示一直进行着的动作.
其次 happen 没有被动的含义·
have 的用法也没有A··
只有ave something done 让宾语被做：done 与 something之间是逻辑动宾关系.
I'll have my hair cut.我要理发（让头发被剪）.
have something do让宾语（去）做 ：something 与 do之间是逻辑主谓关系.
I'll have my friend help me.我要让我的朋友帮我.
have something doing让宾语一直做着 ：something 与 doing之间也是逻辑主谓关系,表示一直进行着的动作.
The teacher had me standing all the time.老师让我一直站着.