look!the teacher,together with his students.now working in the lab A.is B.are C.were D.was选什么?为什么?

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look!the teacher,together with his students.now working in the lab A.is B.are C.were D.was选什么?为什么?

look!the teacher,together with his students.now working in the lab A.is B.are C.were D.was选什么?为什么?
look!the teacher,together with his students.now working in the lab A.is B.are C.were D.was
选什么?为什么?

look!the teacher,together with his students.now working in the lab A.is B.are C.were D.was选什么?为什么?
B
together with就前原则,look为现在进行