I won’t tell the student the answer to the math problem until he on it for more than an hour.
#100166
A
has been working
B
will have worked
C
will have been working
D
had worked
推荐题目
All possible means ___ been tried to stop the air______.
#103381
A
has, polluted
B
have, polluting
C
have, being polluted
D
has, being polluted
He ________ more than 5,000 English words when he entered the university at the age of 15.
#104133
A
has learned
B
would have learned
C
learned
D
had learned
---What a long queue!--- Yeah．We ________________ up in the past few hours for tickets back home．
#102498
A
queued
B
have queued
C
are queuing
D
have been queuing
Mary decided not to work on the program at home because she didn’t want her parents to know what she __________.
#101244
A
has done
B
had done
C
was doing
D
is doing