If a computer crashes,you will lose the file you _____ on if you don’t save it early enough. 
#103552
A
are working
B
work
C
will work
D
worked
推荐题目
When the old man ______ to walk back to his house, the sun ______ itself behind the mountain. 
#100109
A
started; had already hidden
B
was starting; hid
C
had started; had already hidden
D
had started; was hiding