He always gives me useful advice when I ...

He always gives me useful advice when I don’t know next .

A. how to do B. when to do

C. what to do D. where to do

C 【解析】试题分析：句意为：当我不知道接下来做什么的时候，他总是给我提有用的建议。这是一个复合句，从句中又包含宾语从句。结合选项，疑问代词或疑问副词与动词不定式连用，疑问词作句子的一个成分。根据语境，能够作动词do的宾语的只有疑问代词what。故选C。考点：考查动词不定式的用法。

考点分析：

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