There are so many beautiful cars but he is at a loss which to buy. A. to be chosen B. to

问题补充：

There are so many beautiful cars, but he is at a loss which to buy.

A. to be chosen

B. to choose from

C. to choose

D. for choosing

答案：

A. to be chosen

(答案→)B. to choose from

C. to choose

D. for choosing

解析：to choose from从...中选择，动词不定式作后置定于。