今天想起一个语法狗狗

wuyuzhishui

The mitten crabs introduced from China in the 1960's in Germany has become a phenomenon (: that masses of them are migrating up the streams, piling up the dams, and swarmed into the lakes, sometimes wondering on the streets).

我最后选了一个是

, masses of them migrating up the streams, piling up the dams, swarmed into the lakes, and sometimes wondering on the streets.

忘记前面有没有with了，其中有个选项是有with的。

看起来swarmed似乎跟其他几个不平行，但我看另外的选项似乎都不对，所以我当初以为是swarmed就应该用过去分词，不过回来查了查，似乎感觉应该是swarming。不过根据我现在的回忆，我觉得选项里面可能有用了swarming，但有其他错误，你们自己注意

wuyuzhishui

我觉得and不应该在swarmed之前吧？根据这个我似乎排除了几个选项。

MustEnd

谢谢亲~~我把狗狗牵走了~~