it‘s twenty metres tall 对划线部分提问

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it‘s twenty metres tall 对划线部分提问
twenty metres tall 这是划线部分

it's twenty metres tall.it's----------怎样的?how is it?如果是it's twenty metres tall. tall保留那么是it's--------怎样的高答案是how tall is it?所以答案是:how is it?------------最终答案...