(单选题) 31: Learning how to repair computers takes a long time, ______?
A: isn't it
B: aren't they
C: doesn't it
D: don't they
(责任编辑:admin) |
(单选题) 31: Learning how to repair computers takes a long time, ______?
A: isn't it
B: aren't they
C: doesn't it
D: don't they
(责任编辑:admin) |