When you have some difficult math proble...

When you have some difficult math problems, you can ____ your math teacher.

A．turn to

B．to ask

C．turn

D．ask for

A 【解析】本题主要考查短语区别，turn to sb for help向某人求助；ask for sb向某人求助，can 是情态动词后跟动词原形，排除B；C答案不符合结构，根据句意故选D。

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