第一节 单项填空(共15小题;每小题1分,满分15分)
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。
例: It is generally considered unwise to give a child ____ he or she wants.
A. however B. whatever
C. whichever D. whenever
答案是B。
21. — The room is so dirty. ____ we clean it?
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