---Someone is knocking at the door. Is it your brother?
---No, it        be him. He’s gone to Hunan.
A．mustn’tB．won’t　C．can’t　　D．needn’t
C

試題分析：句意：--某人正在敲門。它是你的兄弟嗎？--不，它不可能是他。他已經(jīng)去湖南了。分析：幾種可能表達的方式：must be語氣最為強烈，說話者主觀肯定超過90% 比如：You must be John！你一定是John�。ú豢赡苁莿e人）；can't be是一種否定語氣用法，但主觀語氣確定性大過50% 比如：You can't be John!你不可能是John。（半帶猜測的否定，“你應該不可能是的”）；而選項中mustn’t為禁止之意。故選 C
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