专四
A.Ascertaining
B.Assuming
C.Concerning
D.Regarding
【解析】ascertain“确定(事实),探知”;assume“假定,假想”,assuming相当于given that;concern和regard均可作动词,但concerning和regarding还可作介词,意思为“有关,关于”,后面不直接跟that从句。B为正确答案。
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