单项选择题

A.definingB.implyingC.reducingD.perfectingA considerabl……

A considerable amount of time and money has been invested in () this system.

A.defining
B.implying
C.reducing
D.perfecting

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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