I''m surprised that he ____ to help me when I needed his help .
A．should refuseB．would have refused
C．should have refused toD．may have refused
C。
should 可用于表示驚訝、不快、憂慮等感情色彩的句子中。如指過去的動作，則用“should +不定式的完成式”，而 may 和 would 一般不帶感情色彩。
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