No matter ______ the CRH accident in Wenzhou, it had and will have much warning significance.

A．how the investigators said caused B．what the investigators said caused
C．why the investigators said caused D．the investigators said how caused

B

解析試題分析：考查讓步狀語從句：句意：調查者說是什么導致溫州高鐵事故的發(fā)生，它有著也將會有著警示的作用。因為在讓步狀語從句中the investigators said是主句，后面的賓語從句缺少主語，用what，和no matter一起引導讓步狀語從句，選B。
考點：考查讓步狀語從句

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