Jasmine was holidaying with her family in a wildlife park_ she was bitten on the leg by a lion.

Jasmine was holidaying with her family in a wildlife park_ she was bitten on the leg by a lion.
A.when B.what C.that D.how
The other day ,my brother drove his car down the street at _ I thought
was a dangerous speed.
A.as B.which C.what D.that
为什么?
请详细说明,分析每个选项,