to do the repair and what you need is only a hammer and some nails.A. It is hardB. That

问题补充：

to do the repair, and what you need is only a hammer and some nails.

A. It is hard

B. That is easy

C. That is hard

D. It is easy

答案：

A. It is hard

B. That is easy

C. That is hard

(答案→)D. It is easy

解析：根据what you need is only a hammer and some nails.你只需要一把锤子和一些钉子，可知修理很简单。 to do the repair中真正的主语是to do the repair，所以要用It作形式主语。选D。