问题
单项选择题
They were asked to avoid（）any water which had not been boiled.
A.drinking
B.not to be drunk
C.to drink
D.having
答案
参考答案：A
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They were asked to avoid（）any water which had not been boiled.
A.drinking
B.not to be drunk
C.to drink
D.having
参考答案：A