be able to do 和can---大全708

1.       
The Coast guard is conducting
tests to see whether pigeons can be trained to help find survivors of
wrecks at sea.

(A) to see whether
pigeons can be trained to help find

(B) to see whether
pigeons can be trained as help to find

(C) to see if
pigeons can be trained for helping to find

(D) that see if
pigeons are able to be trained in helping to find（A）

(E) that see
whether pigeons are able to be trained for help in finding

be able to 表示所具备的才能，技能，可以说pigeons are able to help find survivors of wrecks at sea, 但是如果说pigeons 具备可以被人类所训练的能力，不是讲不通了吗， 很别扭。