a,the greens特指一个家庭,用复数,b排除
d是现在完成进行时,指过去的动作持续到现在,将来可能进行,d排除
c,can be则是能保持某种状态故排除
the greens getting ready for their trip
the greens getting ready for their trip
a:are b:is c:can be d:has been
a:are b:is c:can be d:has been
英语人气:353 ℃时间:2019-11-15 20:39:47
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