【单选题】银行贷款分为一次性还清贷款和分期偿还贷款的依据是( )。
【判断题】外国游客可在签证准予在华停留的期限内在华旅行。停留期限到期,如需继续旅游,可向旅行社提出申请延长在中国的停留期限。
【简答题】John often attends public lectures at the University of Oxford, chiefly ________ his English. A) to improve B) improving C) to have improved D) improved
【单选题】John often attends public lectures at the University of Oxford, chiefly _______his English.