Card 0 of 1
Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.
I have no clear idea who I am speaking to.
This is a very common error of pronoun case, which leads the sentence to incorrectly conclude with a preposition. Rather than using the subjective-case "who" in saying "who I am speaking to," it is correct to use the objective-case "whom." The correct version of the sentence reads, "I have no clear idea to whom I am speaking."
Compare your answer with the correct one above