This is my twin sister, Lucy. Not only she but also I _______ good at drawing.

下列各项句子中“之”字意义与用法不相同的一组是（ ）

Hdiscover the secret cave.

Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.

I told Mom that not everyone could manage to have 3 meals on time everyday, ________？