He wlll be an astronaut by the time he ____ thirty.
A: will be
B: has been
C: is
D: is going to be
A: will be
B: has been
C: is
D: is going to be
举一反三
- He'll be an astronaut by the time he ______ thirty. A: is B: had been C: will he D: is going to be
- He’ll be an astronaut by the time he ________ (be) thirty.
- He _____ articles for our newspaper these three years, and he ____ about thirty articles. A: has written, has been writing B: is writing, has been writing C: has been writing, wrote D: has been writing, has written
- John has never been on time, ( )? A: as John B: has not John C: has he D: has not he
- He does not work full time there, but he has been the