The verb ing form is used as the object complement to make sentences?

1) Verb -ing emphasizes that the action is going on when it is used as an object complement after sensory verbs such as see, hear and watch. For example:

When I walked into the office, I saw a girl using my computer.

2) In the with compound structure, the present participle indicates the active relationship, and often has the meaning of progress. For example:

The poor man begged from door to door, followed by many children.

3) When the verb v-ing is used as an object complement after verbs such as have, leave and keep, it forms the structure of have/leave…+ object +doing, which means "make…keep do…", in which the verb v-ing emphasizes that the action is going on or the state is continuing. For example:

The next morning, she found the old man lying in bed, dead.

Now, let's take a look at the above two college entrance examination questions. The first question means "Peter has just received a letter saying that his grandmother will come to see him soon." This question examines the verb -ing as an attribute, so choose C. In the second question, there is an active relationship between smell and flowers, so the verb -ing is used as an attribute, so the answer is B.