It ( ) seven years since he began to teach English here.a.is b.have beenc.has d.is for要理由的

翻译 It's seven thirty. It's twenty to seven It's a q______to seven he's seven years old. seven years old 划线部分提he's seven years old. seven years old 划线部分提问 It's seven .It's_____to go school. What's five and seven?It's( ). what's eight and seven? it's it's seven thirty 用what提问 It's a quarter past seven now It's seven twenty now是什么意思 It's _____ seven twenty.填介词 It's seven fifteen now.提问句 ,It's seven fifteen(前一句） It's seven now.(划线部分提问) _____________?It's seven o'clock. It's a q___ past seven. It's seven o'ciock问句 it's a--- seven in the e---