Question

It’s necessary _________ us _________ more trees in spring every year.

A．of; to plant	B．for; to plant
C．of; planting	D．for; planting

Answer 1

B

试题分析：句意：每年春季栽更多的树对我们来说是必须的。这是一固定句式“It’s+形容词+for sb.to do sth.”，故选B。