容易产生金融危机的国家一般实行(    )。
   A．相对固定的汇率制度    B．持续国际收支逆差
   C．资本流动自由    D．浮动汇率制度

He has to stay at home to study English for a test.(改一般疑问句) ______he______to stay at home to study English for a test? 点击查看答案

He hates doing chores because it's boring.(对画线部分提问) 点击查看答案