A.after
B.for
C.about
D.in
第1题:
You'd better tell him what to do next as soon as he _______ back.
A:come
B:came
C:is coming
D:comes
第2题:
Make( )copies of important files, and store them on separate locations to protect your information.
A.back B.back-up C.back-out D.background
第3题:
第4题:
I will finish my homework before my sister_____back.
A、come
B、comes
C、will come
D、is coming
第5题:
第6题:
按照要求写出对应命令:在当前目录下新建一个目录back,将当前工作目录更改为back,在back目录下新建2个空文件test1、test2,然后把test2移到其父目录中并改名为file3。