单项填空
请认真阅读下面各题，从题中所给的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. There is no doubt that the Diaoyu Islands are ________ part of China and what some Japanese have done recently is actually ________ offence against Chinese people.
A. a; / B. a; the C. the; / D. /; an
22. South Korean star PSY's “Gangnam style” video, ________, has set the Guinness World Record for the most “liked” video in YouTube history.
A. broke records B. breaking records C. to break records D. breaks records
23. This tower, _____ they are planning to have decorated, is always the best place to have a view of the sea.
A. where B. which C. what D. that
