A warm thought suddenly came to me I might substitute the hero to buy some flowers for his mother’s 60th birthday.
A. if
B. when
C. that
D. which
网友回答
A. if
B. when
C. that
D. which
解析： 考查名词性从句。that引导同位语从句，进一步解释名词thought。因为本句谓语部分短小，因此把从句放到了谓语部分的后面，形成分隔同位语从句，that在从句中不充当句子成分。