摘要： -Have the students started to work on their experiment? -Yes, it . A. has done B. is going to be done C. is being done D. is to be done [解析]选C.由Yes可知.实验已经开始.也就是说实验正在被做.因此用现在进行时的被动语态.
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—Have the
students started to work on their experiment?
—Yes, it ________.
A．has done
B．is going to be done
C．is to be done
D．is being done
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—Have the students started to work on their experiment?
—Yes, it ________.
A．has done
B．is going to be done
C．is to be done
D．is being done
查看习题详情和答案>>