The research he doveted himself to ___ some important findin

选B produced
The research he doveted himself to ___ some important findings. 选B produced.
他全身心投入的研究产生了一些重要的发现.
主句是：The research produced some important findings.
he doveted himself to 这是个定语从句,修饰限定了前面的research.从定语从句的时态过去式可知时态是过去式doveted ,决定主句的时态是过去时态.