—What did your math teacher say ?— She said I was .A. work hard B. working hardlyC. hard-w

—What did your math teacher say ?
— She said I was .
A. work hard
B. working hardly
C. hard-working
D. hard work

A. work hard B. working hardly(答案→)C. hard-workingD. hard work解析：英语中两个或多个单词中间可以用短横线连接起来，起一个相当于形容词的作用，这类单词叫做合成词。其一般构成规则就是其构成单词一般都要用原形。句意:你的数学老师说什么了？——她说我学习很努力。work hard努力工作，不能和be动词连用；working hardly，语义不通； hard-working相当于形容词，努力工作的；hard work名词性短语，困难的工作。结合语境可知下文描述的是过去的某种状态，故用形容词作表语，选Ｃ。

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