第二部分：英语知识运用（共两节，满分35分）
I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．---We’re going to America next month.
---Oh, ____? Great!
A．really B．yes C．truly D．what
22．_____the end of last year, he_____ English so well that he began to write naturally in English.
A．In; has learned B．By; had learned
C．At; had learned D．From; learned
