It’s necessary _________ us _________ more trees in spring every year.
A．of; to plantB．for; to plant
C．of; plantingD．for; planting
B

試題分析：句意：每年春季栽更多的樹對我們來說是必須的。這是一固定句式“It’s+形容詞+for sb.to do sth.”，故選B。
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