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

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。