完型填空Waiting__1__the crowded streets,on top of a __2__110 sto

完型填空
Waiting__1__the crowded streets,on top of a __2__110 stories high,was Philippe Pettit.This daring Frenchman was about to walk a tightrope between the two towers of the World Trade Center.
A.for B.in C.by D.above
上面的选项是第1题的下面的是第2题的选项,刚才忘打了,不好意思.
A.roof B.position C.wall D.building