Once ______ , the plan can’t be changed.
#97200
A
begin
B
beginning
C
began
D
begun
推荐题目
 _______ the task on time, he was fired by the boss.
#98451
A
Not completed
B
Not having completed
C
Not have completed
D
Not being completed
 _________ their final medical check, the astronauts boarded their spacecraft. 
#94285
A
Received
B
Being received
C
To receive
D
Having received
        ,Mom had a cup of coffee and a few minutes’ rest.
#98946
A
With her housework done
B
With her housework being done
C
With her housework doing
D
With her housework to do
--- Did you understand what the teacher said ?---Yes! She explained the text in detail to make her lessons __________.
#94064
A
easy understood
B
easily to understand
C
easily understood
D
easy understand