1)If he had the right to choose his holiday,he would go to Mexico.
2)If I were not allergic to the shellfish,I could eat them.
3)If the marble statue were not too large for the housewife's garden,she would buy it.
4)If we knew much about the disease,we could treat the patients very effectively.
楼上的太强啦,我修改答案时候抄我的……千万别选他!BS…… 你看他but都没改成buy……