China ---- the WTO and became a new member of it last year.a.joined b.join c.will join d.hasjoinedd.has joined

问题描述:

China ---- the WTO and became a new member of it last year.
a.joined b.join c.will join d.hasjoined
d.has joined

看题目中有became 和last year,所以应该用完成时 has joined

a

A

d