It is quite obvious _____ has caused the traffic jam during the rush hour recentlyA.thatB.whenC.whatD.how选哪个?为什么?

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It is quite obvious _____ has caused the traffic jam during the rush hour recentlyA.thatB.whenC.whatD.how选哪个?为什么?
It is quite obvious _____ has caused the traffic jam during the rush hour recently
A.that
B.when
C.what
D.how
选哪个?为什么?

It is quite obvious _____ has caused the traffic jam during the rush hour recentlyA.thatB.whenC.whatD.how选哪个?为什么?
C.what
_____ has caused the traffic jam ——什么导致了交通堵塞

c

A强调句而已

c
什么导致了交通拥挤已经很显然

A.that

c

C.
It is quite obvious (that省略了) what has caused the traffic jam during the rush hour recently.

C