女主人考虑得很周到，在我们到来之前把房子打扫得干干净净。(thoughtful)

(1)So thoughtful was the hostess that she had cleaned the house thoroughly prior to our arrival.

= The hostess was so thoughtful that she had cleaned the house thoroughly prior to our arrival.

(2)So thoughtful was the hostess that she had cleaned the house throughly before we arrived.

=The hostess was so thoughtful that she had cleaned the house thoroughly before we arrived

(3)It was so considerate/thoughtful of the hostess to clean the house thoroughly before our arrival.

= The hostess was so considerate/thoughtful to clean the house thoroughly before our arrival.

(4)It was considerate/thoughtful of the hostess to clean the house thoroughly before we arrived.

=The hostess was  considerate/thoughtful to clean the house thoroughly before our arrival.

女主人考虑得很周到，在我们到来之前把房子打扫得干干净净。(thoughtful)

It was thoughtful of the hostess to clean the house thoroughly before we arrived.

【说明】thoughtful表示“体贴的”、“考虑周到的”的意思时，是表示品格特征的动态形容词，可以用于 sb. is （或 was）+ adj. + of 或者 it is（或 was）+ adj. + of 结构。例如：He is always thoughtful of others . 他总是感谢他人。/ It was thoughtful of you to make all the necessary arrangements for me . 你考虑得真周到，为我们作了一切必要的安排。（摘自《薄冰英语惯用法词典》）