We are convinced that we are on the _______ of an important discovery.

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问题 We are convinced that we are on the _______ of an important discovery.

选项 A、threshold
B、household
C、thread
D、entrance

答案A

解析 threshold开始，开端；household家庭，一家人；thread线，线索，思路；entrance入口，入门。

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考博英语

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