Question

The student, who ________ about what to do next, turned to his teacher for help．

1. A.
   was puzzling
2. B.
   was puzzled
3. C.
   is puzzling
4. D.
   puzzled

Answer 1

B
puzzled通常形容人，意为“使困惑的”，可以和be动词构成系表结构；puzzling通常形容物，意为“令人困惑的”。