Question

To help Tommy learn better, his parents have done           they could：cards,
tapes，special learning centers，in short, everything they can think of．
A both        B all        C none       D neither

Answer 1

B

此处考查不定代词。由下文的cards,tapes，special learning centers可知，此处是指三者或三者以上的事情。Both意味两者都；none意为三者或三者以上的都不；neither意为两者都不。