题目

________ one is fully prepared, outdoor sports can sometimes mean injuries. A．Until  B．Because C．When  D．Unless 答案：D解析：句意：除非有充分准备，否则户外运动有时会意味着受伤。根据语意选D项，表示“如果不……；除非……”。Oh, look! Here’s a photo ______ in my classroom at primary school. Can you recognize me in it?A．takingB．was takenC．takenD．been taken