D
process为名词,所以前面需要一个形容词修饰,固A.B排除
up and down固定搭配,起伏不定,没有+S的形式
5.Learning languages is a long,______ process with ______ and it is too easy just to give up.
5.Learning languages is a long,______ process with ______ and it is too easy just to give up.
A) gradually,ups and downs \x05B) gradually,up and down
\x05C) gradual,ups and downs \x05D) gradual,up and down
A) gradually,ups and downs \x05B) gradually,up and down
\x05C) gradual,ups and downs \x05D) gradual,up and down
英语人气：967 ℃时间：2020-01-09 10:01:24
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