In fact 伐 (question mark in shanghainese , equivalent to mandarin 吗) is written
(argh this character is not handle properly ;( )
is written 口+伐
http://www.unicode.org/cgi-bin/...t=%F0%A0%B2%8E
but as you can type it only with wu input method and as this character is "shanghainese-only", most of fonts doesn't render it, so except in books,,none use it, youths all type 伐