从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
21. You ________ help me if you don't have time. I can do the job myself.
[A] aren't able to [B] don't have to [C] aren't going to [D] mustn't
22. Next August, Bob and Sue _________ for 10 years.
[A]
全国英语等级考试二级模拟试题(一)
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