组卷网 > 高中英语综合库 > 语法 > 名词性从句 > 宾语从句 > 宾语从句的连接词 > 连接词whether/if引导宾语从句
题型:单项选择 难度:0.85 引用次数:342 题号:6674902
Theresa May asked Russian officials to explain ________ they were responsible for the chemical attack in Salisbury, England.
A.ifB.that
C.whichD.where

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