从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题纸上将该项涂黑。
21．The driver was at loss when word came that he was forbidden to drive because of speeding.
A．a; the B．/; / C．the; the D．a; /
22. I think you should complain— , of course, you are happy with the way things are.
A. if B. unless C. as D. because
23. I wonder why Ann didn’t get the job. She is the right person for it.
A. to be offered B. to offer C. offering D. offered
24. The rich only themselves in making money and had no eye for the needs and welfare of their workers.
