Question

She was so touched by the generosity that she was _____ for words.

1. A.
   in loss
2. B.
   in a loss
3. C.
   at loss
4. D.
   at a loss

Answer 1

D
at a loss for是一固定搭配，意为“困惑，不知所措”，这里意为“说不出话来，不知说什么好”。