答案：中共七届二中全会。
答案：中共七届二中全会。
A. whether or not I had finished my work
B. did I finish my work or not
C. is my work finished or not
D. if or not I have finished my work
解析：解析:whether or not
A. complain
B. in complaining
C. for us complain
D. with us to complain
解析：解析:no point in doing sth.解析:point:价值 There＇s not much point in complaining, they never take any notice.
A. to sit
B. to sit on
C. for me to sit
D. for sitting
A. what can they
B. what they can
C. how they can
D. how can they
A. which
B. in which
C. when
D. Both B and C
A. had waited after
B. had been waiting since
C. was waiting from
D. had been waiting for
解析：解析:等某人 wait for sb.解析:for接一段延续的时间,since接过去时间状语或过去时句子。
A. carries out
B. will carry out
C. carry out
D. carried out
A. gap
B. interrupting
C. opening
D. margin
