36. I think they’ve got to the very point _______ a change is needed, or they will fail.

A．when

B．which

C．where

D．That

设向量组α₁，α₂，α₃线性无关，则下列向量组中，线性无关的是（）。

A．α₁+α₂，α₂+α₃，α₃-α₁

B．α₁+α₂，α₂+α₃，α₁+2α₂+α₃

C．α₁+2α₂，2α₂+3α₃，3α₃+α₁

D．α₁+α₂+α₃，2α₁-3α₂+22α₃，3α₁+5α₂-5α₃