问题
选择题
Who saw it ______ at that time?
[ ]
A. happen
B. happened
C. happens
D. to happen
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Who saw it ______ at that time?
[ ]
A. happen
B. happened
C. happens
D. to happen
答案：A