A.①+②+③ B.①+②+④ C.①+③+④ D.①+③十⑥
A.①+②+③ B.①+②+③+④ C.①+②+③+④+⑤ D.①+②+③+④+⑤+⑥
A.①+②+③ B.①+②+③+④+⑥ C.①+②+③+④+⑤ D.①+②+③+④+⑤+⑥