I'll go to see my math teacher when he ____ from Australia.

I'll go to see my math teacher when he ____ from Australia.
A、will return
B、return
C、returns
D、returned
【正确答案】：C
【题目解析】：考察主将从现；主语will go to see 为将来时，因此从句要使用一般现在时，C符合题意。