问题补充:
Mom had asked Jack to close the window before he went out, he forgot to do it.
A. Though; /
B. Though; but
C. Till; /
D. Until; then
答案:
(答案→)A. Though; /
B. Though; but
C. Till; /
D. Until; then
解析:考查though的用法。句意“尽管妈妈让杰克出去前记得关窗户,但是他还是忘记了。”though不能与but连用。故选A。