17.D本句考查动词的被动语态和时态.it+is+动词ed形式.to do是固定的搭配用法.而Bunsen Burner的发明是过去发生的动作.所以用完成时态. 查看更多

 

题目列表(包括答案和解析)

用-ing形式的被动语态合并句子

I am laughed at in the public.I don’t like it.

=I don’t like ________.

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用-ing形式的被动语态合并句子

You can’t imagine what great trouble they have solving the problem.The problem is being talked about.

=You can’t imagine what great trouble they have solving the problem ________.

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用-ing形式的被动语态合并句子

I had taught the boy many times.The boy still didn’t know how to do the exercised.

=________, the boy still didn’t know how to do the exercises.

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用所给词的被动语态填空

More people ________ (treat) in hospital this year than at any other time since the start of the Health Service.

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用-ing形式的被动语态合并句子

He had not been promoted.Tony was very angry.

=Tony was very angry at ________ to a higher position.

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