Agatha Christie was a very popular English writer. Before she died, she (write) over 100 mystery novels. a. has written b. was written c. had written d. was writing

Had written

Explanation:

had written completes the sentence with the correct verb tense

answer: this is not a good thesis statement because a thesis statement is not supposed to have questions in it. a thesis states your position on your topic. a question cannot state anything because it is not a statement. a question is a great lead in to a thesis, but it can't be the thesis.