Question

The students were ________ over the ________ problem，listening to the teacher with a ________ expression on their faces.

1. A.
   puzzled；puzzling；puzzling
2. B.
   puzzled；puzzling；puzzled
3. C.
   puzzling；puzzling；puzzled
4. D.
   puzzling；puzzled；puzzling

Answer 1

B
形容詞辨析。Puzzled感到困惑的,通常形容人；puzzling令人困惑的，通常形容事物；expression表情，它與人有關(guān)，所以仍然用puzzled修飾。句意：帶著困惑的表情聽老師講課，學(xué)生們對(duì)于那個(gè)令人困惑的問題感覺很困惑。