He the test, but he wasn't careful enough. A. could have passed B. were able to
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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
试题答案
答案：A
解析：Could + 完成时态，表示对过去事情的可能推测。
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