单项选择题


A．searching
B．researching
C．studying
D．on working
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单项选择题
A．inquireB．amplifyC．followD．observe
A．inquire
B．amplify
C．follow
D．observe
单项选择题
A．providedB．offeredC．suggestedD．discovered
A．provided
B．offered
C．suggested
D．discovered
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