A warm thought suddenly came to me I might use the pocket money to buy some flowers for m

问题补充：

A warm thought suddenly came to me I might use the pocket money to buy some flowers for my mother’s birthday.

A. if

B. when

C. that

D. which

答案：

A. if

B. when

(答案→)C. that

D. which

解析：that在此引导同位语从句，修饰名词thought。此题的难点是，名词thought与修饰它的同位语从句被分离开了。