单项选择题


A．normal
B．ordinary
C．proper
D．appropriate
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单项选择题
A．searchingB．researchingC．studyingD．on working
A．searching
B．researching
C．studying
D．on working
单项选择题
A．inquireB．amplifyC．followD．observe
A．inquire
B．amplify
C．follow
D．observe
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