has more than doubled
问题描述：
has more than doubled
the price of grain has more than ___since last year.
A.double B.doubled C.twice D.twiced
B
don't leave your work ___
A.done half B.half done C.a half done D.done a half
B
it's ___ walk from here to my school
A.two-hours B.two hours C.two-hour D.a two hour
D
答
第一个,double在这里做动词用,你看has后面应该加一个动词过去分词吧,这样才能形成现在完成时.twice不行,因为twice不能做动词.double 可以,a又不是完成时,所以.第二个,leave sth这种表达方式后面要介形容词或者形容词...