四六级考试

【单选题】
A、Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.

网考网参考答案：D
网考网解析：
How long does the training period last document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>