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在《PONS词典》中的词汇

bone up 动词 不及物动词

to bone up on sth
etw büffeln [o. pauken]
Present
Ibone up
youbone up
he/she/itbones up
webone up
youbone up
theybone up
Past
Iboned up
youboned up
he/she/itboned up
weboned up
youboned up
theyboned up
Present Perfect
Ihaveboned up
youhaveboned up
he/she/ithasboned up
wehaveboned up
youhaveboned up
theyhaveboned up
Past Perfect
Ihadboned up
youhadboned up
he/she/ithadboned up
wehadboned up
youhadboned up
theyhadboned up