Class Two ____ taking their lessons when there was a knock at the door.为什么A. is B. are C. was D. were

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Class Two ____ taking their lessons when there was a knock at the door.为什么A. is         B. are          C. was          D. were

Class Two ____ taking their lessons when there was a knock at the door.为什么A. is B. are C. was D. were
Class Two ____ taking their lessons when there was a knock at the door.为什么
A. is B. are C. was D. were

Class Two ____ taking their lessons when there was a knock at the door.为什么A. is B. are C. was D. were
B.are 这里表示同学在上课
是指人所以用复数形式