The church is gonna be crawling with people,教堂会被人群塞满

crawl with:爬满了, 满是

The ground was crawling with ants.

地上满是蚂蚁。

The resort is crawling with tourists.

这个游览胜地到处都是旅游者。

so we're not gonna be able to figure out who "A" is.因此我们就无法摸清A是谁了

figure out:出, 解决

I can't figure out why he is absent.

我弄不明白他为什么缺席。

He's trying to figure out a way to solve the problem.

他正在努力想办法解决这个问题。

be able to:会, 能

They appear to be able to handle the problem.

他们似乎可以处理这个问题。