单项选择题

Those experiments have laid a solid foundation for his （）research in material science.

A. far
B. deep
C. farther
D. further

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单项选择题
（）in a company, Miss Li will become a famous pop singer.

A. It is an employee that
B. She was an employee
C. An employee before
D. Once an employee
单项选择题
So little （）about mathematics that the lecture was completely beyond me.

A. I knew
B. do I know
C. did I know
D. have I known
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