21.Tom can＇t speak Chinese, but Peter.

A. do

B. does

C. did

D. done

正确答案：B

解析：

21.【翻译】汤姆不会讲汉语，但是彼得会讲汉语。【精析】B根据句意可知，此处是表示主语的能力，所以应用一般现在时，故排除选项C、D。因为but后面分句的主语是第三人称单数Peter,所以其后的谓语动词应用单数形式does。注意，这里是用助动词does代替前面的speak Chinese 故选 B

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