问题补充：
--- Have we water?
--- Yes, . We’d better get some.
A. run out of; we have run it out
B. run out of; our water has run out
C. run out of; our water has been run out
D. run out; our water has been run out.
答案：
A. run out of; we have run it out
(答案→)B. run out of; our water has run out
C. run out of; our water has been run out
D. run out; our water has been run out.
解析：考查固定词组。固定词组：Run out of sth用完某物；sth run out某物用完，耗尽；句意：—你们的水用完了吗？—是的。我们的水已经用完了。我们最好去取点水。故B正确。
