d吧
clear up有澄清的意思,表示解决问题．
但如果用look up的话则必须以人作主语才行．
this dictionary is very useful,it has______many problems about idiom for me
this dictionary is very useful,it has______many problems about idiom for me
a.look up b.kept up c.taken up d.cleared up
选什么,为什么
a.look up b.kept up c.taken up d.cleared up
选什么,为什么
英语人气：931 ℃时间：2020-03-24 18:00:57
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