I didn’t know it could do terrible to your heart and lungs or was more difficult for smoki

问题补充：

I didn’t know it could do terrible to your heart and lungs or was more difficult for smoking couples to become pregnant.

A. ruins; that

B. damage; it

C. damage; that it

D. sufferings; that this

答案：

A. ruins; that

B. damage; it

(答案→)C. damage; that it

D. sufferings; that this

解析：第一空考查名词搭配：do damage to对…造成破坏，ruins废墟，suffering痛苦，第二空考查第二个宾语从句的that不可以省略，而且宾语从句中用的是;it’s+adj+to do，句意：我不知道它会对你的心肺造成可怕的损害，也不知道对抽烟的夫妇而言怀孕更难。选C。