Lack of confidence is a big___to investment in the region. squareA.gap squareB.block squareC.problem squareD.barrier

一、单选题。(共50题，总共100分) 49. Lack of confidence is a big___to investment in the region.(2分) $\square$
A.gap $\square$
B.block $\square$
C.problem $\square$
D.barrier

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