class是个集合名词,要结合具体意义判断单复数
第一句中,做测验是每个人都在做,强调班级的学生,学生有很多,所以是复数
第二句中,首先后面有its,说明是单数,其次,这里的意义是全班的照片,照片强调整个班级,为一个整天,所以是单数
The class ( ) doing experiments on heat and light in the lab
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