2. 外语
  3. Now it is important that our drinking water ______ purified.

Now it is important that our drinking water ______ purified.

admin2009-05-28  59
问题 Now it is important that our drinking water ______ purified.
选项 A、should be
B、is
C、will be
D、was
答案A
解析 现在已到了我们的饮用水需要净化的关键时刻了。在It is + adj. It that... 结构中，如果形容词为important, necessary, desirable, advisable, surprising, essential, urgent, vital, possible, impossible等作表语时，从句要使用虚拟语气，即 (should) +动词原形 (do) ，should可以省略。
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