So many deeds cry out to be done, and always urgently.

= So many deeds cry out to be done, and they always cry out to be done urgently.

你可以看出，and实际并列了二个分句，第二个分句与第一个分句重复的部分被省略了，只保留了额外的状语。通过这种方式，always urgently得以突出、强调。

本句是通过省略第二分句重复的部分来达到突出状语的作用。还有一种结构是用指示代词that第一分句，然后加状语。例如：

I love you, and that very much.

that指代 I love you. 所以上句等于：

I love you, and I love you very much.

这比直接说 I love you very much. 更为强调状语very much.

网友的句子也可以用这种结构：

So many deeds cry out to be done, and that always urgently.