从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. —Do remember to charge the battery 12 hours when you first use it.
— .
A. Made it B. Got it C. Understood it D. Remembered it
22. —I saw Jane and her boyfriend in the park at eight yesterday evening.
—Impossible. She TV with me in my home then..
A. watched B. had watched C. would watch D. was watching
23. ____ you may be right, I can’t altogether agree.
A. While B. As C. If D. Since
