I was completely confused by the way ___he operated the machineA\howB\asC\by which D\不填为什么?

I was completely confused by the way ___he operated the machineA\howB\asC\by which D\不填为什么?
I was completely confused by the way ___he operated the machine
A\how
B\as
C\by which
D\不填
为什么?

I was completely confused by the way ___he operated the machineA\howB\asC\by which D\不填为什么?
D
the way 后可跟三种固定搭配：
1.the way in which
2.the way that+从句
3.the way \

D 不填.
the way 已经代表了 how 方法了, 所以不用填.

选D

D