单项选择题

His inability to learn foreign languages was a(n) obstacle to his career.

A．barrier
B．excess
C．carrier
D．impulse
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单项选择题
To their great surprise, they found the floodwater had damaged the building's foundation.
A．underlain
B．underlined
C．undertaken
D．undermined
单项选择题
Mr. Johnson was a passionate person filled with an incredible dynamism.
A．energy
B．endurance
C．effort
D．endeavor
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