请高手讲解句子

选D

不能用不定式，因为不定式表示目的，在这不行。

B和E不对。注意这个句子的主语是the migratory birds。如果用定语从句（这儿只能用非限定性定语从句），后面应该出现一个介词to。

The migratory birds use the same nests (every) year,and the nests are added new material each time不对，后半句可以这样改：
and new material are added to the nests each time。
或者是， to which new material are added every year.

The migratiry birds use the same nests every year,----- new material each time.
A and will add
B which are added
C to add
D adding
E added
1.A.鸟飞回到以前用过的巢，每年天一些新的东西。（省略了they/birds)
2.如果用A ,必须是and add ...
E.不可以。因为有new material 作宾语。

3如该为并列句如下对否 The migratory birds use the same nests year,and the nests are added new material each time
完全可以.
4如把逗号后改为定语从句
The migratiry birds use the same nests every year,where mew material are added each time.

D