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
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