John plays the piano _____, if not better than, David. But he never shows off in public.
A.as well
B.as well as
C.so well
D.so well as
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B解析这是一个比较状语从句，引导比较状语从句的连词和词组有：as…as,than, not so…as, the more…, the more…等。这是个肯定句，所以不能用D，因为有比较的对象也就是有宾语，所以不能省略第二个as.