Question

【题目】—When is a good time________trees?

—Spring，I think.

A. planted B. paint C. planting D. to plant

Answer 1

【答案】D

【解析】句意：——什么时候是植树的好时节？——我认为是春天。a good time to do sth.做某事的好时候，动词不定式用作后置定语。故答案为D。