—Do you still remember when we went to the Great Wall?—I can’t remember it well,

游客2025-07-21 2

问题 —Do you still remember when we went to the Great Wall?—I can’t remember it well, but______sometime last autumn.

选项 A、it might be
B、it must have been
C、it could have been
D、it could be

答案 C

解析本题考查情态动词的用法。根据句意：“我记不清了，好像是去年秋天的什么时候。”表示对过去某种现实情况的猜测用could+动词现在完成时态。故正确的答案为C。

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