The WHO has given some advice on to prev...

The WHO has given some advice on to prevent us being infected(感染)with H7N9.

A. how B. what

C. where D. when

A 【解析】试题分析：句意：WHO已经给出一些怎样使我们免受H7N9的建议。A) how怎样；B) what什么； C) where 哪里； D) when什么时候，根据句意是“怎样”，所以选A。考点：考查宾语从句的引导词

考点分析：

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