题目内容
() 4. If you are weak a subject, and asking a teacher for advice are helpful.
A. at;working hard B. in;work hard C. at;work at D. in;working hard
4.D
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题目内容
() 4. If you are weak a subject, and asking a teacher for advice are helpful.
A. at;working hard B. in;work hard C. at;work at D. in;working hard