It is desirable that water used for drinking ______ pure.

It is desirable that water used for drinking ______ pure.
A、were
B、should be
C、is
D、ought to be
【正确答案】：B
【题目解析】：译文：真希望饮用水是纯净的。在英语中，当主句是it is desirable（strange等表情感、意愿的形容词）that...时，从句的谓语动词常用should结构。答案为B。