his research has contirbuted greatly ------our understanding of this disease 填介词

his research has contirbuted greatly ------our understanding of this disease 填介词

题目
his research has contirbuted greatly ------our understanding of this disease 填介词
答案
his research has contirbuted greatly --to----our understanding of this disease
他的研究对于理解这种疾病起到了很大的促进作用.
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