第二部分 英语知识运用
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。
21. Dark clouds are gathering. It _____ rain.
A. will B. is going to C. should D. is to
22. We were in ________ when we left that we forgot the airline tickets.
A. a rush so anxious B. a such anxious rush
C. so an anxious rush D. such an anxious rush
23. I have _______ for about a month.
A. caught a cold B. had a cold C. have a cold D. catch a cold
