温馨提示：
此套题为Word版，请按住Ctrl,滑动鼠标滚轴，调节合适的观看比例，答案解析附后。关闭Word文档返回原板块。
课时提升作业(二十)
Ⅰ. 单项填空
1. difficult and challenging the task may be, we must finish it on time, because there is a possibility our work will go down in history.
A. Whatever; that B. However; as
C. Whatever; which D. However; that
2. Don’t to the public when we will start our project.
A. give off B. give away
C. give in D. give back
3. (2013·盐城模拟)To our puzzlement, the written record of our conversation
