请教885的21部分22提

塞开！

限定修饰

那A呢?A为什么不对? 我想是不是因为A和C都是需要用被动的呀.Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.是不是应该是"Unlike most warbler species, the male and female blue-winged warbler are very difficult to be told apart.

c中也是一样，除了TIANWAN版主说的以外, Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to distinguish  是不是应该用"  Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to be distinguished."

谢!

(A) Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.

warbler因该用复数，因为后面是are！

除了以上的细节，是不是其中有逻辑的含意在内？ to tell ...apart is difficult.

the ... warbler(s) are very difficult to tell apart. 总感觉warblers不能成为 be difficult的主语.

盼NN, 答复.