-This problem is very difficult. -I know,but Jack has working it out.
#38799
A
succeed in
B
succeeds in
C
succeeding in
D
succeeded in
推荐题目
The meeting _________ by the time I got there yesterday.
#40511
A
was on
B
has been on
C
had begun
D
has begun
Progress ____so far very good and we are sure that the work will be finished on time.
#36154
A
was
B
had been
C
has been
D
will be