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

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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