Allen has decided that he will be an eng
题型:选择题
问题:
Allen has decided that he will be an engineer by the time he ________ twenty.
A.had been
B.is going to be
C.will be
D.is
Allen has decided that he will be an engineer by the time he ________ twenty.
A.had been
B.is going to be
C.will be
D.is