至少（）个社团联合举办活动，必须首先向校团委申请报批，经书面批准后方可开展。
A.1
B.2
C.3
D.4
参考答案：B
---You look very tired.
---Well, __________my lessons all the afternoon.
A．I have reviewed my lessons
B．I have been reviewing
C．I reviewed
D．I had reviewed
被立案调查对象在工作中有何限制？
