高等继续教育 / 大学英语语法
正确率：100%
题型描述: 单选题
Now we can fly to Tokyo. There was a time ＿＿＿＿ we had to take a boat.
A.when
B.why
C.how
D.what
Now we can fly to Tokyo. There was a time ＿＿＿＿ we had to take a boat.
A.when
B.why
C.how
D.what
参考答案：
佳题速递：