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A<-->C
B
baby-sit临时照顾 baby-sat baby-sat
be(am / is / are)是 was / were been
beat击打 beat beaten
become 变成 became become
begin 开始 began begun
bend 使弯曲 bent bent
bet 赌 bet bet
bite 咬 bit bitten / bit
blow 吹 blew blown
break 打破 broke broken
bring 拿来 brought brought
build 建造 built built
burn 燃烧 burnt / burned burnt / burned
buy 买 bought bought
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