以下3个句子,选哪个都可以：
Tony is so energetic that he could hardly feel tired.
Tony is so energetic that he hardly feels tired.
Tony is so energetic that he is hardly tired.
以下3个句子,选哪个都可以：
Tony is so energetic that he could hardly feel tired.
Tony is so energetic that he hardly feels tired.
Tony is so energetic that he is hardly tired.