It's amazing () they've managed to get everything finished so quicklyA.howB.why

It's amazing () they've managed to get everything finished so quicklyA.howB.why
It's amazing () they've managed to get everything finished so quickly
A.how
B.why

It's amazing () they've managed to get everything finished so quicklyA.howB.why
选A
【分析】
这句话翻译成：大家都很惊奇,他们是怎么那么快完成这一切事务的.

正常情况下，选a

选A.
大家都很惊奇他们是怎样快速完成这一切的。