题目内容
(请给出正确答案)
[单选题]
It is desirable that water used for drinking() pure.
A.were
B.should be
C.is
D.ought to be
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A.were
B.should be
C.is
D.ought to be
第1题
A.On/On
B.On/Auto
C.Passive/Active
D.Desirable/Auto
E.Active/Active
F.Desirable/Desirable
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