Yes, but we would want to know that you have some definite and constructive plan for how you will spend it. Except that we would expect all candidates to take English Literature, it does not matter. That said, our general criteria for selection are that candidates should be well-read and obviously committed to literature and able to think about it in a flexible and intelligent way. Decisions will be made largely on the results of your interviews and will not be affected by the choice of A levels you are taking or have taken. They should not be timed essays, critical analysis or creative writing.
Essays done for either English literature or English language courses are acceptable.
At least one essay should be on an English literature topic. We interview as many candidates as possible, and in practice most English candidates at Christ Church are interviewed. You have two interviews at Christ Church, with two or three interviewers each time. At one interview you will be asked to discuss major literary works or authors, and the interviewers will probably test you by suggesting alternative interpretations of the works under discussion to see what you can make of them. They will probably, but not necessarily, ask about subjects you have written on in your submitted work.