问题补充:
单选题Whenyouhavesomedifficultmathproblems,youcan____yourmathteacher.A.turn toB.to askC.turnD.ask for
答案:
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
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