题目内容

There are different kinds of presents in the gift shop. I can’t decide _______.
A．to buy whatB．to buy which
C．what to buyD．which to buy
D

试题分析：根据语境可知此题考查的是疑问词+动词不定式的基本用法。此句的含义是在礼物商店里有不同的礼物，我不能决定该买哪一个，根据选择项的提示可知A和B的结构不正确，C表示买什么，因为这里面都是礼物，故词义不通，故选D。
点评：“”是英语中常用的一种结构。在句中可以作主语、动词或介词的宾语以及表语。此外，当宾语从句由连接代词who, which, what或连接副词when, where, how等引导时，有时可以与“疑问词 + 动词不定式”结构互相转换 。 但是，主句中的主语与从句中的主语须一致。
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