高等继续教育 / 大学英语语法
正确率：100%
题型描述: 单选题
John will be able to do it ＿＿＿＿＿＿ his vacation.
A.at
B.during
C.since
D.while
John will be able to do it ＿＿＿＿＿＿ his vacation.
A.at
B.during
C.since
D.while
参考答案：
佳题速递：