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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。
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