单项选择题

()had made great contributions to science is a fact.

A. What he
B. Which he
C. He
D. That he

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单项选择题
It is not difficult to teach () students.

A. smart
B. fashionable
C. sensitive
D. vital
单项选择题
Don’t you think () a special committee to study the problem

A. us better to form
B. it better we to form
C. we better form
D. it better for us to form
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