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I tried hard to get some information about the new technology out of his mouth, but he remained____________.

A. quiet            B. secret      C. silent     D. calm

I tried hard to get some information about the new technology out of his mouth, but he remained____________.

A. quiet            B. secret      C. silent     D. calm

I tried hard to get some information about the new technology out of his mouth, but he remained        ．

A．quiet       B．still C．silent D．calm  

I tried hard to get some information about the new technology out of his mouth, but he remained____________.

A. quiet            B. secret      C. silent     D. calm

I tried hard to get some information about the new technology out of his mouth, but he remained_________．

       A．quiet            B．secret          C．silent           D．calm