问题补充:
-- My brother bought me an iPhone 5, but I don’t know . Can you help me?
-- Let’s read the instructions.
A. what to use
B. how to use
C. what to use it
D. how to use it
答案:
A. what to use
B. how to use
C. what to use it
(答案→)D. how to use it
解析:本句的意思应该是“我不知道如何用它。”AB选项用what明显不对,因为用的就是iPhone5;另外,当用How时后面的动词应该有宾语。所以本题选D。