Question

The students, ________ at the way the question was put, didn't know how to answer it.

1. A.
   being surprised
2. B.
   surprised
3. C.
   surprising
4. D.
   having surprised

Answer 1

B
解析：過去分詞作狀語(yǔ)，補(bǔ)充說明主語(yǔ)的狀態(tài)，相當(dāng)于who were surprised。