Answer: not been...
Explanation: i think please let me know if wrong....
sorry I cant help but I hope you find someone soon! have a great day my friend!
The complex sentence is A. After Henry submitted his essay, he realized that he hadn't proofread the last page.
<u>A complex sentence is a sentence that contains an independent clause and a dependent clause</u>. In contrast to an independent clause, a dependent clause cannot stand alone to form a complete sentence. Moreover, dependent clauses are always introduced by a subordinating conjunction. In this sentence,<u> the dependent clause is "After Henry submitted his essay", the subordinating conjunction is "after" and the independent clause, which can stand by itself, is "he realized that he hadn't proofread the last page"</u>.
Hi. Your question is incomplete because you didn't show what should be used in the essay. This prevents the essay from being done exactly as you need it. I hope this helps you and that you can adapt it to the requirements of your question.
A. is the correct answer; "Several dirty footprints" makes sense. All the other verbs do not agree with their subjects.