问题
选择题
---Look at those shoes, Mike!
---Wow! They look very cool, but I wonder ________.
A．how much are they
B．how much do they cost
C．if my parents will buy them for me
D．that my parents will buy them for me
答案
答案：C
if既可以引导宾语从句又可以引导状语从句。if充当宾语从句的连接词时，相当于whether，词义为“是否”，遵循宾语从句的时态规则，可根据语境选择任何时态；