---Jack didn’t pass the examination last week. ---? He had been working so hard at his les

问题补充：

---Jack didn’t pass the examination last week.

---? He had been working so hard at his lessons.

A. What for

B. Pardon

C. Did he

D. How come

答案：

A. What for

B. Pardon

C. Did he

(答案→)D. How come

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