从A、B、C、D四个选项中选出最佳选项填入空白处，并在答题卡上将该项涂黑
21. Don’t be upset. I think Tom, rather than you, _______.
A is to blame B are to blame
C is to blamed D are to blamed
22. I’m considering buying a new car, because my old car _____ a lot.
A breaks into pieces B breaks down
C breaks through D breaks up
23. He suggested that the source of all the water supplies ______.
A were examined B was examined
C must examine D be examined
