A:promise
B:promised
C:will promise
D:had promised
周期/族
IA
ⅡA
ⅢA
ⅣA
ⅤA
ⅥA
ⅥⅠA
0
2
①
②
③
④
3
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
Many people cut down trees ____ (make) more money.
辆汽车在4s内做匀加速直线运动,初速为2m/s,末速为10m/s,在这段时间内( )