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【参考答案】

把the adding改为adding。
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把so改为while。
单项选择题
A．The former was on teaching and the latter is on research.B．The former was on teaching and the latter is on the combination of teaching and research.C．The former was on the combination of teaching and research and the latter is on teachingD．The former was on research and the latter is on teachin
A．The former was on teaching and the latter is on research.
B．The former was on teaching and the latter is on the combination of teaching and research.
C．The former was on the combination of teaching and research and the latter is on teaching
D．The former was on research and the latter is on teachin
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