Question

My sister, an inexperienced rider, was found sitting on the bicycle ______ to balance it.

1. A.
   having tried
2. B.
   trying
3. C.
   to try
4. D.
   tried

Answer 1

B
考查非谓语动词。trying to balance it是动词的-ing形式作伴随状语。A项表示这个动作发生在主句的谓语动作之前，显然错误；后两项语法不正确。