Scientists warn us _____ the need to ke...

Scientists warn us _____ the need to keep an eye ____ the greenhouse effect.

A．to; in

B．of; to

C．in; on

D．of; on

D 【解析】试题解析：考查介词，warn sb of 固定用法，警告，预先通知；keep an eye on 关注，注意，句意是科学家警告我们关注温室效应是很必要的。考点：词组搭配。

考点分析：

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