题目内容

Deserts and high mountains have always been a ____________ to the movement of people from place to place. 【CET-4真题】

A. barrier
B. fence
C. prevention
D. jam

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Hosts and guests were matched up by Airbnb, a firm _________in San Francisco.【CET-4 真题】

A. based
B. basic
C. barrier
D. bask

I couldn't _________ to spend three hours sitting in a train every day.【CET-4 真题】

A. base
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C. bargain
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A. Believe
B. To believe
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The candidate is speaking on__of his party.

A. behave
B. belief
C. behalf
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