Arriving there, they found the boy dead.刚一到那儿，他们就发现那男孩死了。
The secretary worked late into the night, ______ a long speech for the president.
A to prepare B preparing C prepared D was preparing
Having finished his homework, he went out for a walk.
After he had finished his homework, he went out for a walk.
______ a reply, he decided to write again.
A Not receiving B Receiving not
C Not having received D Having not received