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It's___last week that the haze in Beijing caused many proble

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It's___last week that the haze in Beijing caused many problem
A,reports B.reported C is reported D was reported
不太清楚……
It's___last week that the haze in Beijing caused many proble
不会吧,正确的是B
It' s reported 据报道……
因为原句已有动词BE,排除A C 与D

再问: 哦抱歉打错了……原句是 It___last week that the haze in Beijing caused many problems
再答: last week 上周,一般过去时,故正确的是D