1.I’d like to arrive 20 minutes early ______ I can have time for a cup of tea.
A. as soon as B. as a result C. in case D. so that
【答案】D。解析：本题考查动词so that引导目的状语从句。句意为：我早到20分钟的目的是能有时间喝点茶。as soon as一……就……，引导时间状语从句；as a result结果；in case以免，万一（发生……）。故选D。
2.Had the governments and scientists not worked together, AIDS-related deaths _______ since their highest in 2005.
A. had not fallen B. would not fall
C. did not fall D. would not have fallen
【答案】D。解析：根据题干从句中had置于句首可知，此处为虚拟语气中连词if省略情况。由从句中谓语动词had not worked（had done）可知，是对过去情况的假设，所以主句中的谓语动词应用would/could/might/should have done来表示对过去情况的假设。故选D。
3.It was the training _____ he had as a young man _____ made him such a good engineer.
A. what; that B. that; what C. that; which D. which; that
【答案】D。解析：此题考查的强调句型中包含一个定语从句。Which引导的定语从句，修饰被强调部分the training。把修饰部分he had as a young man去掉，剩余部分为强调句，强调主语the training，故用it was ... that 句型强调，句意为：正是他年轻时候参加的训练使得他成为这样一名优秀的工程师。故选D。