第二部分：英语知识运用（共两节，满分45分）
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. I was under ________ pressure from my parents to become _________ engineer.
A. the; an B. the; the C. a ; / D. / ; an
22．I didn’t know how to work out this problem. _______, there was nobody who could help me.
A. To make matters worse B. That’s to say C. or rather D. In other words
