The bus that pulling up outside the inn wpuld soon take the visitors downtown.

问题描述:

The bus that pulling up outside the inn wpuld soon take the visitors downtown.


1. pulled up
2. is pulling up
3. was pulling up
都可以.
第一个表示情况(巴士的到来)已结束,
第二个表示事情还在进行中,
第三个是叙述形式的过去进行时.