Be careful when you surf the Internet．If you download a virus into your computer ______, you will not open your files．
#27181
A
on purpose
B
by accident
C
at random
D
on average
推荐题目
Luckily, we’d brought a road map, _________ we would have lost our way.
#26651
A
without it
B
with that
C
without which
D
without that
“How long have you worked on the farm?” “_________ the end of last year.”
#28926
A
In
B
By
C
At
D
Since
________ my surprise, ________ I could have a word with him, he left.
#26171
A
In; before
B
To; before
C
In; when
D
To; since