-Have the students started to do the experiment?-Yes,it______.A.was done B.was doing C.is being done D.is tobe done

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-Have the students started to do the experiment?-Yes,it______.A.was done B.was doing C.is being done D.is tobe done

-Have the students started to do the experiment?-Yes,it______.A.was done B.was doing C.is being done D.is tobe done
-Have the students started to do the experiment?-Yes,it______.
A.was done B.was doing C.is being done D.is tobe done

-Have the students started to do the experiment?-Yes,it______.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
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。

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.

选c
作业正在被做

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