小明和爸爸现在年龄的和是34岁，3年后爸爸比小明大24岁，今年小明多少岁？[ ]
A.29
B.5
C.8
答案：B
=（）。
A．0
B．e-1
C．e-2
D．e
--Was his father very strict with him when he was at school?---Yes.He had never praised him ___ he became one of the top students in his grade.
A．after
B．unless
C．until
D．when
=（）。