美人鱼的冒险传奇:-Have the students started to do the experiment? -Yes,it______.答案及原因

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A.was done B.was doing C.is being done D.is tobe done

C
问题是是否开始，现在完成时态，START为短暂性动词，不可持续。
回答为实验正在被进行，

选A或B是发生在过去的时刻，实验完成。
D为将来时态

C

学生们已经开始做试验了吗？
是的，他们正在做。

C
-学生们已经开始做实验了吗?
-是的,实验正在进行(直译:实验正在被做)

该情景对话中,YES 是针对第一问而答的. IT 指的是实验,IT IS BEING DONE 是作为补充内容的.

A.was 完成了 B.was 做 C.is 身为完成了 D.is tobe 完成了
选C

选c
作业正在被做

C
现在完成进行时。
学生们已经开始做试验了么？
是的，正在进行。

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