问三题英文语法27. – Sunny had to give a speech in front of 500 peop

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问三题英文语法
27. – Sunny had to give a speech in front of 500 people yesterday. bad world
– Whew! That’s a big audience. She _____ have been nervous at the beginning. A. must B. should C. need D. shall
28. You would have spent _____ time if you had done the calculation on the computer.
A. more
B. most…
C. less
D. least
29. I had wanted to help you last night but I couldn’t spare any time, for I _____ a composition
which I have to hand in this morning. A. wrote
B. was writing
C. had written
D. have written
答案：27.A 28.C 29 B
我要详细的解说谢谢

27.must+V 可以表示推测,此句意思为：他一开始一定很紧张.
28.这里是虚拟式,如果你用电脑做这些计算的话你会更省时间的.（事实上“你”并没有使用电脑.）
29.这里是过去进行时,表示过去某一刻正在进行的动作.
很高兴帮到你,还有疑问请追问.

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