单项选择 较易0.85 引用1 组卷867
________ he driven more carefully, the accident would not have happened the other day.
| A．Be | B．Had | C．Has | D．Would have |
2011·重庆·一模
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Without coconuts, most of the tropical islands in the South Pacific ________ uninhabitable for both animals and people.
| A．must have remained | B．may have remained |
| C．need have remained | D．would have remained |
Mary wishes that she ________ law instead of history when she was in college.
| A．had studied | B．studies | C．has studied | D．studied |
His failing in the exam _____us because he was always an outstanding student.
| A．pleased | B．astonished |
| C．excited | D．frightened |
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