Mr. Smith kept on Astudying Chinese and Buse it Cuntil he Dhad mastered it.

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问题 Mr. Smith kept on Astudying Chinese and Buse it Cuntil he Dhad mastered it.

选项 A、 
B、 
C、 
D、 

答案B

解析 从句意来判断,use应该与studying并列,都是[]kept on的宾语。因此B错,应改为using.Keep(on)doing:继续进行,坚持下去,穿或戴着不脱,继续留用。
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