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?
人气:247 ℃ 时间:2019-11-25 17:00:39
解答
C.what
_____ has caused the traffic jam ——什么导致了交通堵塞
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