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. ——What would you do if you are forced to do something?
——_____________, I would probably do nothing.
A. Forcing to do something B. Forced to do something
C. Forced doing something D. If forced to do something
22. Described as _____enormous round plate, it spins slowly in ____space to imitate____ pull of the earth’s gravity.
A. an…a…the B. a…the…the C. an…/…the D. an…/…a
