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— 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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