摘要： He the test, but he wasn’t careful enough. A. could have passed B. were able to pass C. must have passed D. might be able to pass 答:A.此题考查虚拟语气的含蓄条件句. he wasn’t careful enough )为真实情况.若变成与实际相反的假设.应是 If he had been careful enough, he could have passed.

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