问题
选择题
Ram explained to his mother _____ he would get home late that night because of extra work.
A．that
B．which
C．what
D．whether
答案
答案：A
题目分析：句意：Ram向妈妈解释因为加班他会晚上晚回来。这里的explain to sb 后面接that引导的宾语从句，that只是连接从句，不做成分，what和which在从句中要做主语或宾语，whether“是否”，所以选A。