从A、B、C和D四个选项中，选出可以填入空白处的最佳选项。
21. John plays football ______, if not better than, David.
A. as well B. as well as C. so well D. so well as
22. Although I enjoy______ to music, I don’t know ______about it.
A. listen; many B. listening; much C. listening; many D. to listen; much
23. If you don’t go to the party, ______ I.
A. so do B. so will C. nor do D. neither shall
