If only I_____how to operate a computer as you do! 
#89926
A
had known
B
wou欤?know
C
should know
D
knew
推荐题目
If we _______ adequate preparations, the conference wouldn’t have been so successful.
#87422
A
haven’t made
B
wouldn’t make
C
didn’t make
D
hadn’t made
If he _________ more time practicing speaking English before, he ____ able to speak it much better now.
#86465
A
spent; will be
B
had spent; would have been
C
spent; would have been
D
had spent; would be