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--Who is the person talking with you just now? -- Well, if you know, his name is

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--Who is the person talking with you just now? -- Well, if you know, his name is

--Who is the person talking with you justnow?

-- Well, if you ______ know, his name isDavid.

A.may

B.can

C.must

D.shall

 

试题答案

【答案】

C

【解析】略