Mr.Yang,along with a number of students,experiments in chemistry in the lab at that moment.A doesB doC was doingD were doing为什么呢?讲讲吧

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Mr.Yang,along with a number of students,experiments in chemistry in the lab at that moment.A doesB doC was doingD were doing为什么呢?讲讲吧
Mr.Yang,along with a number of students,experiments in chemistry in the lab at that moment.
A does
B do
C was doing
D were doing
为什么呢?讲讲吧

Mr.Yang,along with a number of students,experiments in chemistry in the lab at that moment.A doesB doC was doingD were doing为什么呢?讲讲吧
at that moment 说明只能用进行时,故排除A,B.而如果像这样,句中有with或along with,那么谓语动词就和其前面的主语保持一致,例如:He with his friends is watching TV now.所以句中谓语动词应与Mr.Yang保持一致,故选C喽

因为后面有个that moment 意思是在那时 整句话说 杨老师和一些学生 那时正在实验室做实验 关键一个词就是那时正在 突出那个时候正在做实验 这件事 所以用过去进行时