Answer:
Holmes' secret plan comes to fruition when a guileless Sir Henry heads home across the moor, only to be attacked by the hound.
Explanation:
In option C all the words are a form of the verb "to be"
were: simple past,
be: infinitive
been: past participle
being: present participle
so this is the correct answer, as "to be" is a helping verb<span />
To group together or accumulate
Choose the Appropriate Time and Audience.
Use a Hook to Engage the Listener.
Keep It Concise.
Highlight Emotional Elements.
Don't Rush.
Poke Fun at Yourself and Nobody Else.
Vary Your Rate of Speech and Volume.
Ask Listeners to Imagine.
