—We 'll go camping tomorrow morning I promise. —Maybe by then you your mind.A. changedB.

问题补充：

—We ll go camping tomorrow morning, I promise.

—Maybe by then you your mind.

A. changed

B. are changing

C. will have changed

D. have changed

答案：

A. changed

B. are changing

(答案→)C. will have changed

D. have changed

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