____ hour (A) a (B) an 并说明理由

____ hour (A) a (B) an 并说明理由 There is ( )''h'' in the word ''hour''.A:a B：the C:an 请说明理由, Mary spent half ____ hour doing ____ work.A.a;an B.an;a C.a; on的反义词是____ (A) off (B) under 并说明理由 并说明理由1 .He can ___a bicycle at an amusement park .A,lend B,h ___________ hour (a)an (B) a There are sixty minutes in ____ hour . A.a B.an C.the D./ 选择 说出理由The lawyer is usually paid ( ).a.on the hour b.by an hou they walked for.A,an hour B.half a hour C,half an hour 选哪个 a hour 还是 an hour? a hour 还是 an hour A;For more than half an hour.B;Bad luck!If it____ ____,I'II