CHOOSE THE BEST ANSWER FOR EACH OF THE FOLLOWING SENTENCES.

17. not / forget / keep / touch / me / if / you / come / Singapore. A. Don’t forget keeping in touch with me if you come to Singapore. B. Don’t forget to keeping in touch with me if you come to Singapore. C. Don’t forget to keep in touch with me if you come to Singapore. D. Don’t forget kept in touch with me if you come to Singapore.