急!请英语好的回答!1、It is necessary to build modern power stations w

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急!请英语好的回答!
1、It is necessary to build modern power stations which will produce electricity as ＿＿＿＿＿＿＿＿＿＿ as possible.
A、efficient B、effective
C、efficiently D、inefficient

2、Everyone learns best from his own ＿＿＿＿＿. 　
A、experience B、choice
C、suicide D、temper

3、No wonder those plants are dying. They ＿＿＿＿＿＿＿＿＿ any water for ages!
A、haven’t had B、haven’t
C、hadn’t had D、hadn’t

4、These three American women ＿＿＿＿＿＿ Chinese in our college for three years.
A、will have studied B、studies
C、have studied D、will study

5、I haven’t seen Mary these past few days. I’m afraid she＿＿＿＿＿ herself for some time.
A、hasn’t been feeling B、is feeling
C、hadn’t been feeling D、was feeling

1.C、efficiently
as adv.as possible 因为前面是动词produce,所以这里是efficiently
2.A、experience
from his own experience 从自己的经历中学习
3.A、haven’t had 后面有for ages,用完成时前面有are,所以是现在完成时
4.C、have studied for+一段时间,用完成时
5.A、hasn’t been feeling for some time 用完成时

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