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If you are weak _____ a subject, ______ and asking a teacher for advice can help.
A.at; working hardB.in; work hard
C.at; work hardD.in; working hard
D

试题分析:句意:如果你在某一科不行,努力学习并向老师请求帮助可能有用。短语be weak in在……方面不行,be good at擅长……,现在分词作主语表示抽象的动作,结合语境可知选D。
点评:英语中介词也有固定搭配,但从语义往往很难解释,熟记一些固定短语的用法是解决此类问题的捷径。英语中原形动词一般不能用作非谓语动词,各种非谓语动词做句子成分表达的含义往往不同。学习中要注意总结这些非谓语动词的不同用法,答题中注意结合语境进行分析。
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