-----I _____without your help. I do appreciate it .
-----You are welcome.
A．can’t manageB．couldn’t manage
C．can’t have managedD．couldn’t have managed
D

試題分析：句意：沒有你的幫忙我本不可能做到。我確實(shí)很感激。--不用謝。根據(jù)句意是虛擬語氣“過去本不可能做而做了” couldn’t have done，A和B是說明的現(xiàn)在的情況，can’t have done不是虛擬語氣而且對(duì)過去的推測“過去不可能做…”，選D。
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