单项选择题
A．help
B．contributor
C．aid
D．element
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单项选择题
A．arrivedB．reachedC．remainedD．concluded
A．arrived
B．reached
C．remained
D．concluded
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单项选择题
A．surveyingB．to surveyC．studyingD．to study
A．surveying
B．to survey
C．studying
D．to study
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A．talkB．searchC．consultD．conserve
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