Question

I haven't decided yet ________ some underwater plants.

1. A.
   whether to get
2. B.
   what to get
3. C.
   whether getting
4. D.
   how getting

Answer 1

A
动词不定式的前面有时可以带一个连接代词或连接副词构成一个不定式短语．这种结构接近于一个名词从句．例如：
The policeman told the old woman which bus to take(＝which bus she should take. )
警察告诉那位老大大乘坐哪一路公共汽车。
其实这种结构在句子中还可以用作主语。这时它的意义接近于一个主语从句。