0ur jumbo boom（）out of use for a long time.
A: is
B: will be
C: have been
D: has bee
A: is
B: will be
C: have been
D: has bee
举一反三
- I have known her for a long time. / She........................ to me for a long time. A: has known B: has been known C: is known
- The program is ________to help people who have been out of work for a long time.
- The traffic lane（）suspended. A: has B: have C: has been D: have bee
- The cause and effect for the time being. A: are not found out B: have not been found out C: were not found out D: has not been found out
- We ______out by that time that he______a thief for a long time. A: had found; had been B: had found; was C: found; had been D: found; was