Question

选择什么？为什么？

There are so many kinds of bikes in the store. They are very beautiful. I really don't know _____ to choose.

A. which B. what C. how D. where
并分析一下句子结构

Answer 1

选A
此题是which引导的宾语从句，从句是“疑问词+不定式”结构，做know的宾语。
意思是“商店里有许多种自行车。它们都很漂亮。我真不知道选哪一辆。

Answer 2

There are so many kinds of bikes in the store. They are very beautiful. I really don't know _A____ to choose.

A. which B. what C. how D. where
A符合题意，不知道选择哪一种。

Answer 3

选A，which在这里代指bike，就是说商店里有这么多种类的bike，他们都很好看，我真的不知道选哪一个。which引导宾语从句，做know的宾语，在从句中做主语。

Answer 4

A.which.前面已经给定事物范围bikes，从句中根据前文判断用which。