第一部分 英语知识运用（共两节，满分40分）
第一节 单项选择（共20小题；每小题1分，满分20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。
1. We discussed where to go for a whole morning, but we decided to stay at home_____.
A. at the end B. by the end C. in the end D. on end
2. I don’t know ______ tomorrow. Can you tell me?
A. when we started B. when did we start
C. when we will start D. when will we start
3. Americans and Canadians can understand each other ______ they don’t speak the same kind of English.
A. now that B. even if C. as if D. only if
