(单选题)5: Since we have a focused subject, we should not talk_______.
A: at once
B: at hand
C: at intervals
D: at random
(责任编辑:admin) |
(单选题)5: Since we have a focused subject, we should not talk_______.
A: at once
B: at hand
C: at intervals
D: at random
(责任编辑:admin) |