问题
选择题
I''m surprised that he ____ to help me when I needed his help .
A．should refuse
B．would have refused
C．should have refused to
D．may have refused
答案
C。
should 可用于表示惊讶、不快、忧虑等感情色彩的句子中。如指过去的动作，则用“should +不定式的完成式”，而 may 和 would 一般不带感情色彩。