What does "clams up"(Para. 4)probably mean?A.Works in a high spirit.B.Keeps their mouth sh

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What does "clams up"(Para. 4)probably mean?

A.Works in a high spirit.

B.Keeps their mouth shut.

C.Feels at a loss.

D.Pays great attention.

请帮忙给出正确答案和分析,谢谢!

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