— Did you make it at last?
— Yes. But for your help,it _____ a serious loss.
  A. had caused
B. must have caused
  C. would have caused
D. may cause
C
本句中的關(guān)鍵詞是but for要不是，如果沒有；句義：—你最后成功了嗎？—是的。要不是你的幫助，就會造成巨大的損失的。根據(jù)句義可知取得成功是已經(jīng)發(fā)生的事情，所以所以本句表示的是對過去情況的虛擬，故使用“情態(tài)動詞+have done”；B項(xiàng)must have caused表示對過去情況有把握的肯定推測，不表示虛擬。故C正確。
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